TK14551V [TOKO]
FM IF DETECTOR/AMPLIFIER; FM IF检波器/放大器
| 型号： | TK14551V |
| 厂家： | 
TOKO, INC |
| 描述： | FM IF DETECTOR/AMPLIFIER |
| 文件： | 总32页 (文件大小：335K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
TK14551V
FM IF DETECTOR/AMPLIFIER
FEATURES
APPLICATIONS
ꢀꢀꢀWide Band FSK Demodulation
ꢀꢀꢀWide Band FM Demodulation
ꢀꢀꢀIF Input Frequency ~90 MHz (TYP)
ꢀꢀꢀBalanced Input (IF)
ꢀꢀꢀIncludes Dual High Speed RSSI Outputs. One is for ꢀꢀꢀVideo Signal Demodulation
ꢀꢀꢀWide Band ASK Demodulation
ASK demodulation, another one is for carrier
sensing.
ꢀꢀꢀRSSI outputs are accurate with stable temperature
characteristic and include buffer amplifiers.
ꢀꢀꢀHigh Speed RSSI Comparator for Carrier Sensing
ꢀꢀꢀHIgh Speed Data Comparator (~2 Mbps)
ꢀꢀꢀWide Band Demodulator (~1 MHz)
ꢀꢀꢀBattery Save Function
TK14551
ꢀꢀꢀLow Voltage Operation: 3.0 ~ 5.5 V
ꢀꢀꢀVery Small Package (TSSOP-24)
IF DECOUPLE
IF DECOUPLE
IF INPUT (-)
23 IF INPUT (+)
22 IF GND
DESCRIPTION
IF OUTPUT
21
FM DEMODULATOR INPUT
BATTERY SAVE
IF V
CC
20 RSSI COMP BIAS
The TK14551V is a wide band IF IC capable of operating
up to 90 MHz. It includes an FM demodulator, RSSI, RSSI
comparator and data comparator. These functions can
perform high-speed operations. The TK14551V has a
unique function that allows establishing the demodulation
characteristicsbychangingtheexternalRCtimeconstant,
and not changing the phase shifter constant. The RSSI
output is individually trimmed, resulting in excellent
accuracy, good linearity, and stable temperature
characteristics. Because the TK14551V includes a dual
high-speed RSSI output, it is possible to demodulate AM
simply and to sense the carrier level at the same time.
19 RSSI OUTPUT-1
GND
V
18 RSSI OUTPUT-2
CC
17 RSSI BUFFERED OUTPUT-1
16 RSSI COMP OUTPUT
15 RSSI COMP GND
FM DEMODULATOR AMP INPUT
FM DEMODULATOR AMP OUTPUT
RSSI BUFFERED OUTPUT-2
DATA COMP INPUT (-)
DATA COMP INPUT (+)
14 DATA COMP GND
13 DATA COMP OUTPUT
BLOCK DIAGRAM
Therefore, the TK14551V is suitable for high-speed data
communication and can be used for various applications.
BIAS
IF
AMP
RSSI
The TK14551V is available in the very small TSSOP-24
surface mount package.
RSSI
Comparator
ORDERING INFORMATION
Demodulator
V
V
CC
CC
TK14551V
BUFF2
Tape/Reel Code
TAPE/REEL CODE
TL: Tape Left
January 2000 TOKO, Inc.
Page 1
TK14551V
ABSOLUTE MAXIMUM RATINGS
Supply Voltage ........................................................... 6 V
Operating Voltage Range.............................. 3.0 to 5.5 V
Power Dissipation (Note 1) ................................ 230 mW
Storage Temperature Range ................... -55 to +150 °C
Operating Temperature Range ...................-40 to +85 °C
Operating Frequency Range............ 0.1 to 90 MHz (typ.)
TK14551V ELECTRICAL CHARACTERISTICS
Test conditions: VCC = 3 V, TA = 25 °C, unless otherwise specified.
MEASUREMENT
POINT (NOTE 2)
SYMBOL
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX UNITS
Battery Save = OFF,
Not including
comparator output
current.
A1
A1
6
10
15
mA
µA
ICC
Supply Current
Battery Save = ON,
Not including
comparator output
current.
0.1
5.0
Voltage at Pin 21 for
standby mode
VSON
Battery Save On
Battery Save Off
-0.1
2.0
0.2
VCC
VDC
VDC
Voltage at Pin 21 for
operation mode
VSOFF
FM DEMODULATION (fIN = 10.7 MHz)
-3 dB Point, 1 kHz ±
100 kHz dev
Limit
Limiting Sensitivity
VA
VA
-65
-59
dBm
Demodulation Output
Voltage
VOUT(DET)
60
55
1
100
160
2.0
mVrms
1 kHz ± 100kHz dev,
-20 dBm input
THD
S/N
Distortion
VA
VA
0.5
65
%
Signal to Noise Ratio
dB
Remove capacitor
between Pin 8 and
Pin 9.
Standard measured
value at 1 kHz
Demodulating
Frequency Band
fDB1
VA
1.5
MHz
Note 1: Power dissipation is 230 mW in free air. Derate at 1.84 mW/°C for operation above 25°C.
Note 2: Refer to Test Circuit.
Page 2
January 2000 TOKO, Inc.
TK14551V
TK14551V ELECTRICAL CHARACTERISTICS
Test conditions: VCC = 3 V, TA = 25 °C, unless otherwise specified.
MEASUREMENT
POINT (NOTE 2)
SYMBOL
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX UNITS
RSSI OUTPUT (fIN = 40 MHz)
No input, DC
measurement
VC
VC
0.00
0.30
0.10
0.45
0.30
0.60
VDC
VDC
-60 dBm non-
modulated input,
DC measurement
VRSSI
RSSI Output Voltage
-30 dBm non-
modulated input,
DC measurement
VC
VC
0.70
1.05
0.95
1.35
1.20
1.65
VDC
0 dBm non-
modulated input,
DC measurement
VDC
fm = 2 MHz (sine
wave),
modulation = 80%,
-40 dBm input
AM Demodulating
Output Voltage
VOAM
VDAM
fDB2
VB
VB
VB
140
230
±1.5
3
360
±3
mVP-P
-60 ~ -15 dBm input,
fm = 2 MHz (sine
wave),
AM Demodulating
Output Voltage
Deflection
dB
modulation = 80%
-6 dB point,
Demodulating
Frequency Band
modulation = 80%,
Standard measured
value at 100 kHz.
2
MHz
RSSI COMPARATOR
TR1
TF1
Rise Time
Fall Time
VD
VD
25
15
50
30
ns
ns
IF no input,
Pin 19 Input
= 1 VDC, Pin 20
Input = 100 kHz,
0.1 VP-P, Square
Wave
(Duty Ratio = 50%,
TR, TF < 10 ns),
DC Offset = 1 VDC
Propagation Delay
Time (Low to High)
tPD1
VD
55
110
ns
Propagation Delay
Time (High to Low)
tPD2
DR1
VD
VD
55
50
110
55
ns
%
Duty Ratio
45
DC measurement,
Output Saturation
Voltage = 0.3 V
ISINK1
Output Sink Current
A2
3.5
5.0
mA
VDC
Output Voltage High
Level
VOUTH1
DC measurement
VD
2.70
2.95
3.00
January 2000 TOKO, Inc.
Page 3
TK14551V
TK14551V ELECTRICAL CHARACTERISTICS
Test conditions: VCC = 3 V, TA = 25 °C, unless otherwise specified.
MEASUREMENT
POINT (NOTE 2)
SYMBOL
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX UNITS
RSSI COMPARATOR (CONT.)
DC measurement,
Output Sink Current
= 5 mA
Output Voltage Low
VOUTL1
Level
VD
0.00
0.30
0.45
VDC
DATA COMPARATOR
Input: DC Offset =
1 VDC,
Propagation Delay
tPD3
VE
VE
55
55
110
110
ns
ns
Time (Low to High)
2 MHz, 0.2 VP-P
,
Square Wave (Duty
Ratio = 50%, TR, TF <
10 ns)
Propagation Delay
tPD4
Time (High to Low)
TR2
TF2
DR2
Rise Time
Fall Time
Duty Ratio
VE
VE
VE
25
15
50
50
30
55
ns
ns
%
Input: DC Offset =
1 VDC,
2 MHz, 0.2 VP-P
Sine Wave
,
45
DC measurement,
Output Saturation
Voltage = 0.3 V
ISINK2
Output Sink Current
A3
VE
VE
3.5
5.0
mA
VDC
VDC
Output Voltage High
Level
VOUTH2
DC measurement
2.70
0.00
2.95
0.30
3.00
0.45
DC measurement,
Output Sink Current
= 5 mA
Output Voltage Low
Level
VOUTL2
RSSI BUFFER AMPLIFIER 2
IOUT
Output Current
DC measurement
DC measurement
A4
VB
±200
130
µA
Ω
ZOUT
Output Impedance
Page 4
January 2000 TOKO, Inc.
TK14551V
TEST CIRCUIT
PG1
PG1
100 mV
50
100 kHz
P-P
T , T < 10 ns
R
V4 = 1 V
SW3
DC = 1.0 V
F
V5 = 1 V
SW4
V3 = 0.9 V
SW2
Comp V
CC
= 3 V
5.6 K
V1 = 0.2 V
CL2
10 pF
10 µF
0.01 µF
1 k
SW1
CL1
10 pF
1 k
V2 = 2.0 V
SG1
50
SW6
VE
VD
SW5
2200 pF
2200 pF
A3
A2
5.6 K
100 pF
VC
51
~
V6 = 3V
NOTE:
V7 = 3V
SG1
FM: 10.7 MHz
1 KHz ± 100 K dev
AM: 40.0 MHz
2 MHz 80% mod
CL1 and CL2 simulate probe capacitance
and stray capacitance.
VD and VE are measured with low capacitance
FET probe (Sony Tektronix P6201).
SG2
1000 pF
1pF
SW10
2 MHz 200mVP-P
Sine Wave
22 K
SW9
SW8
SW7
2200 pF
DC = 1.0 V
0.01 µF 0.01 µF
T1
2200 pF
50
3 K
SG2
1000 pF
0.01 µF
FM IF Coil
T1: 836BH-0268
(TOKO)
3 K
2.2 K
~
10 k
VA
10 µF
0.01 µF
A1
A4
V8
VB
V11 = 0.5 V
CC = 3 V
V9
= 1 V
V10 = 0.9 V
V
CC
47 µF
V
Example of 40 MHz (= fIN) FM detection
56 k
1 pF
2.2 k
1000 pF
22 pF
A638AN-1346ETJ
V
CC
(TOKO)
January 2000 TOKO, Inc.
Page 5
TK14551V
TEST CIRCUIT (CONT.)
Measurement of Battery Save Function:
Battery Save ON: SW1 = 0.2 V position
Battery Save OFF: SW1 = 2 V position
Measurement of Comparator:
SW3 is closed only for the measurement of the RSSI comparator response characteristics and output sink
current, supplying 1 VDC to Pin 19.
PG1 is connected only for the measurement of the RSSI comparator response. Input the pulse wave to Pin 20,
and measure the output wave (VD) of Pin 16.
ISINK1 (RSSI Comparator Output Current):
No IF input. SW2 = V3 position (supplying 0.9 V to Pin 20). SW3 = ON (supplying 1 V to Pin
19). SW5 = V6 position (supplying 3 V to Pin16). Measure the DC current to Pin 16 from
V6.
ISINK2 (Data Comparator Output Current):
SW9 = V9 position(supplying 1 V Pin 11). SW10 = V10 position (supplying 0.9 V to Pin 12).
SW6 = V7 position (supplying 3 V to Pin 13). Measure the DC current to Pin 13 from V7.
Measurement of TR, TF, tPD (RSSI Comparator, Data Comparator):
RSSI Comparator: No IF input. SW2 = PG1 position. SW3 = ON (supplying 1 V to Pin 19). SW5 = VD position.
Measure the output wave (VD).
Data Comparator: SW9 = 3 kΩ position. SW10 = 3 kΩ position. SW6 = VE position. Measure the output wave
(VE).
TR, TF: Measure the time between the 10% point and the 90% point of the output wave.
tPD: Measure the time between the 50% point of the input wave and the 50% point of the output wave.
Measurement of the Logarithmic Detection of RSSI Output:
SW7 = OFF. SW8 = VB position. Input AM modulation signal SG1(fIN = 40 MHz, fm = 2 MHz, mod. = 80%, VIN
= -60, -40, -15 dBm) to Pin 24. Measure the logarithmic detection output voltage of Pin 10.
The AM demodulating output voltage deflection is standardizing the AM demodulating output voltage in the case
of -40 dBm input, and calculated by the deflection by AM demodulating output voltage in the case of -60, -15
dBm input.
The measurement of demodulating frequency band is standardizing the AM demodulating output voltage of Pin
10 in the case that VIN = -40 dBm, fIN = 40 MHz, fm = 100 kHz and 80% AM modulating output voltage at Pin 10,
comparing it to the standard output voltage.
Measurement of Output Current of RSSI Buffer Amplifier 2:
SW7 = OFF. SW8 = V8 position. No IF input. SW4 = ON (supplying 1 V to Pin 18). Measure the DC current
(A4) between V8 and Pin 10 in the case of V8 = 3 V, 0 V.
Measurement of Output Impedance of RSSI Buffer Amplifier 2:
No IF input. SW8 = VB position. SW4 = ON (supplying 1 V to Pin 18). At first, SW7 = OFF and measure the
DCcurrent(VB1)ofPin10. Next, SW7=ONandmeasuretheDCcurrent(VB8)ofPin10. Theoutputimpedance
(ZOUT) is calculated by the following:
ZOUT (Ω) = 10 k • ((VB1 - VB2)/(VB2 - 0.5))
Page 6
January 2000 TOKO, Inc.
TK14551V
PIN FUNCTION DESCRIPTION
PIN
NO.
TERMINAL
VOLTAGE
SYMBOL
IF DECOUPLE
IF DECOUPLE
INTERNAL EQUIVALENT CIRCUIT
DESCRIPTION
1
2
1.8 V
1.8 V
1.8 V
1.8 V
Pin 1,2: The terminal to
connect the bypass
capacitor of the IF
limiter amplifier.
IF V
CC
23 IF INPUT (+)
24 IF INPUT (-)
Pin 23: IF Limiter
Amplifier Non-inverting
Input.
1.5 k
50 k
1.5 k
50 k
Pin 24: IF Limiter
Amplifier Inverting Input.
3
IF OUTPUT
2.0 V
IF Limiter Amplifier
Output.
IF V
CC
1 k
4
IF DEMODULATOR
INPUT
3.0 V
FM Detector Input.
Connection for the
phase shift circuit.
IF V
CC
5
IF VCC
3.0 V
Power supply terminal
of IF limiter amplifier,
RSSI buffer amplifier-2
and FM detector
6
7
GND
VCC
0 V
GND Terminal
3.0 V
Power supply terminal
of RSSI buffer amplifier-
1, RSSI comparator,
and data comparator
January 2000 TOKO, Inc.
Page 7
TK14551V
PIN FUNCTION DESCRIPTION (CONT.)
PIN
NO.
TERMINAL
VOLTAGE
SYMBOL
INTERNAL EQUIVALENT CIRCUIT
DESCRIPTION
8
FM
1.4 V
Pin 8: FM Detector Post
Amplifier Input.
IF V
CC
DEMODULATOR
AMP INPUT
9
1.4 V
Pin 9: FM Detector Post
Amplifier Output.
FM
DEMODULATOR
AMP OUTPUT
1.4 V
10 RSSI BUFFERED
OUTPUT-2
RSSI Buffer Amplifier-2
Output.
IF V
CC
11 DATA COMP
INPUT (-)
Pin 11: Data
Comparator Inverting
Input.
IF V
CC
12 DATA COMP
INPUT (+)
Pin 12: Data
Comparator
Non-inverting Input.
13 DATA COMP
OUTPUT
Pin 13: Data
IF V
CC
Comparator Output.
The output circuit is
open collector.
14 DATA COMP GND
0 V
Pin 14: The terminal to
terminate the data
comparator output.
Page 8
January 2000 TOKO, Inc.
TK14551V
PIN FUNCTION DESCRIPTION (CONT.)
PIN
NO.
TERMINAL
VOLTAGE
SYMBOL
INTERNAL EQUIVALENT CIRCUIT
DESCRIPTION
15 RSSI COMP GND
0 V
Pin 15: The terminal to
terminate the RSSI
comparator output.
IF V
CC
16 RSSI COMP
OUTPUT
Pin 16: RSSI
Comparator Output.
The output circuit is
open collector.
17 RSSI BUFFERED
OUTPUT-1
RSSI Buffer Amplifier-1
Output.
IF V
CC
18 RSSI OUTPUT-2
19 RSSI OUTPUT-1
Pin 18, 19: RSSI
Output.
V
IF V
CC
CC
These terminals are
current outputs,
converted to a voltage
by connecting the
external resistor
between the output
terminals and GND.
20 RSSI COMP BIAS
RSSI Comparator
Non-inverting Input.
Supply the reference
voltage.
IF V
CC
January 2000 TOKO, Inc.
Page 9
TK14551V
PIN FUNCTION DESCRIPTION (CONT.)
PIN
NO.
TERMINAL
VOLTAGE
SYMBOL
INTERNAL EQUIVALENT CIRCUIT
DESCRIPTION
21 BATTERY SAVE
VBS
Battery Save Control.
100 k
100 k
Battery Save OFF:
VBS = 1.5 V to VCC
Battery Save ON:
VBS < 0.3 V
22 IF GND
0 V
GND Terminal
Page 10
January 2000 TOKO, Inc.
TK14551V
TYPICAL PERFORMANCE CHARACTERISTICS
TA = 25 °C, unless otherwise specified.
FM DEMODULATION
S+N, N, THD, AM OUT (f = 10.7 MHz)
FM DEMODULATION
S+N, N, THD, AM OUT (f = 40 MHz)
in
in
20
16
12
20
16
12
0
0
V
= 3 V
V
= 3 V
CC
= 10.7 MHz
CC
= 40 MHz
f
f
in
in
S+N
S+N
fm = 1 kHz
fm = 1 kHz
dev. = ±100 kHz
dev. = ±100 kHz
-20
-20
-40
-60
-40
-60
AM OUT
(30% mod.)
AM OUT
(30% mod.)
8
4
0
8
4
0
N
N
-80
-80
THD
THD
-100
-100
-120 -100 -80 -60 -40 -20
0
20
-120 -100 -80 -60 -40 -20
0
20
IF INPUT LEVEL (dBm)
IF INPUT LEVEL (dBm)
RSSI BUFFER OUTPUT VOLTAGE
vs. IF INPUT LEVEL
RSSI BUFFER OUTPUT VOLTAGE
vs. IF INPUT LEVEL
(FREQUENCY CHARACTERISTICS)
(V
CHARACTERISTICS)
CC
2.0
1.6
2.0
1.6
f
= 40 MHz
V
= 3 V
in
CC
1.2
0.8
0.4
0.0
1.2
0.8
0.4
0.0
V
CC
f
in
40 MHz
70 MHz
90 MHz
5.5 V
5.0 V
4.0 V
3.0 V
-120 -100 -80 -60 -40 -20
0
20
-120 -100 -80 -60 -40 -20
0
20
IF INPUT LEVEL (dBm)
IF INPUT LEVEL (dBm)
LOGARITHMIC DETECTION
AM DEMODULATION VOLTAGE VS.
IF INPUT LEVEL
LOGARITHMIC DETECTION
AM DEMODULATION VOLTAGE VS.
DEMODULATING FREQUENCY
1000
1000
V
= 3 V
CC
= 40 MHz
f
in
500
300
500
300
fm = 2 MHz
mod = 80%
100
100
V
= 3 V
CC
= 40 MHz
50
30
50
30
f
in
mod = 80%
10
10
-120 -100 -80 -60 -40 -20
0
20
10k 30k 100k 300k 1M 3M 10M
IF INPUT LEVEL (dBm)
MODULATING FREQUENCY fm (Hz)
January 2000 TOKO, Inc.
Page 11
TK14551V
TYPICAL PERFORMANCE CHARACTERISTICS (CONT.)
TA = 25 °C, unless otherwise specified.
IF LIMITING
SUPPLY CURRENT vs.
SUPPLY VOLTAGE
AMPLIFIER GAIN
vs. INPUT FREQUENCY
100
80
20
16
V
= 3 V
CC
12
8
60
40
20
0
4
0
2
3
4
5
)
6
1
3
5
10
30 50
100
V
(V
CC DC
INPUT FREQUENCY (MHz)
RSSI BUFFER OUTPUT VOLTAGE
vs. TEMPERATURE
SUPPLY CURRENT vs.
TEMPERATURE
2.0
1.6
20
16
V
= 3 V
CC
= 40 MHz
f
in
0 dBm input
1.2
0.8
0.4
0.0
12
8
-30 dBm input
-60 dBm input
-90 dBm input
4
0
-40 -20
0
20 40 60 80
-40 -20
0
20 40 60 80
TEMPERATURE (°C)
TEMPERATURE (°C)
LOGARITHMIC DETECTION AM
DEMODULATION VOLTAGE, AM
DEMODULATION OUTPUT
vs. TEMPERATURE
RSSI BUFFER OUTPUT VOLTAGE vs.
IF INPUT LEVEL
(TEMPERATURE CHARACTERISTICS)
2.0
400
300
8
6
V
= 3 V
CC
= 40 MHz
V
= 3 V
= 40 MHz
CC
f
in
f
in
fm = 2 MHz
mod. = 80%
1.6
V
= -40 dBm
in
AM Demodulating
Output Voltage
1.2
0.8
0.4
0.0
200
100
0
4
2
0
TEMP. (°C)
85
50
25
0
-20
-40
AM Demodulating Output
Voltage Deflection
-120 -100 -80 -60 -40 -20
0
20
-40 -20
0
20 40 60 80
IF INPUT LEVEL (dBm)
TEMPERATURE (°C)
Page 12
January 2000 TOKO, Inc.
TK14551V
TYPICAL PERFORMANCE CHARACTERISTICS (CONT.)
TA = 25 °C, unless otherwise specified.
FM DEMODULATION
LOGARITHMIC DETECTION
AM DEMODULATION VOLTAGE,
AM DEMODULATION OUTPUT
vs. SUPPLY VOLTAGE
DEMODULATION OUTPUT VOLTAGE,
TOTAL HARMONIC DISTORTION
vs. TEMPERATURE
200
160
120
5
400
300
8
6
V
= 3 V
CC
= 10.7 MHz
f
in
fm = 1 kHz
dev. = ±100 kHz
4
3
AM Demodulating
Output Voltage
V
OUT
V
= 3 V
CC
= 40 MHz
f
in
200
100
0
4
2
0
fm = 2 MHz
mod. = 80%
in
80
40
0
2
1
0
V
= -40 dBm
AM Demodulating Output
Voltage Deflection
THD
-40 -20
0
20 40 60 80
2
3
4
5
6
TEMPERATURE (°C)
V
(V )
CC DC
FM DEMODULATION
FM DEMODULATION
S/N, -3 dB LIMITING SENSITIVITY
vs. TEMPERATURE
DEMODULATION OUTPUT VOLTAGE,
TOTAL HARMONIC DISTORTION
vs. SUPPLY VOLTAGE
5
80
70
-40
-50
200
160
120
V
= 3 V
V
= 3 V
CC
= 10.7 MHz
CC
= 10.7 MHz
f
in
f
in
fm = 1 kHz
dev. = ±100 kHz
fm = 1 kHz
dev. = ±100 kHz
4
3
S/N
V
OUT
-60
-70
-80
60
50
40
80
40
0
2
1
0
-3 dB Limit. Sens.
THD
-40 -20
0
20 40 60 80
2
3
4
5
6
TEMPERATURE (°C)
V
(V )
CC DC
FM DEMODULATION
S/N, -3 dB LIMITING SENSITIVITY
vs. SUPPLY VOLTAGE
DATA COMPARATOR
TRANSIENT RESPONSE
(RISE)
80
70
-40
-50
V
= 3 V
V
= 3 V
CC
= 10.7 MHz
CC
f
in
fm = 1 kHz
dev. = ±100 kHz
OUT
(1V/div)
S/N
-60
-70
-80
60
50
40
IN
(0.1V/div)
-3 dB Limit. Sens.
2
3
4
5
6
V
(V )
CC DC
20 ns/div
January 2000 TOKO, Inc.
Page 13
TK14551V
TYPICAL PERFORMANCE CHARACTERISTICS (CONT.)
TA = 25 °C, unless otherwise specified.
DATA COMPARATOR
TRANSIENT RESPONSE
(FALL)
DATA COMPARATOR
OUTPUT DUTY RATIO
vs. INPUT VOLTAGE
100
80
60
V
= 3 V
CC
V
= 3 V
CC
= 2 MHz
f
in
OUT
(1V/div)
40
IN
(0.1V/div)
20
0
0
100
200
(mV
300
400
20 ns/div
V
)
P-P
IN
FM DEMODULATION
FREQUENCY
CHARACTERISTICS
S CURVE CHARACTERISTICS
2.0
1.6
V
= 3 V
CC
= -20 dBm
V
IN
RD = 1 k
1 pF
22 k
C
1.2
0.8
RD
836BH-0268
(TOKO)
V
RD = 2.2 k
10.3 10.7 11.1 11.5
CC
9.9
IF INPUT FREQUENCY (MHz)
DEMODULATION OUTPUT VOLTAGE
vs. DEMODULTING FREQUENCY
RD = 2.2 kΩ
DEMODULATION OUTPUT VOLTAGE
vs. DEMODULTING FREQUENCY
RD = 1.0 kΩ
2
0
2
0
0 dB = 104.4 mVrms
C = none
0 dB = 30.7 mVrms
C = none
-2
-4
-6
-8
-2
-4
-6
-8
C = 330 pF
C = 330 pF
C = 1000 pF
C = 1000 pF
C =
10 pF
V
= 3 V
C =
47 pF
V
= 3 V
CC
= 10.7 MHz
CC
= 10.7 MHz
f
f
in
dev. = 100 kHz
in
dev. = 100 kHz
C =
47 pF
C =
10 pF
-10
-12
-10
-12
1k
3k 10k 30k 100k 300k 1M
1k
3k 10k 30k 100k 300k 1M
MODULATING FREQUENCY fm (Hz)
MODULATING FREQUENCY fm (Hz)
Page 14
January 2000 TOKO, Inc.
TK14551V
TYPICAL PERFORMANCE CHARACTERISTICS (CONT.)
TA = 25 °C, unless otherwise specified.
ASK Demodulation Output Wave, Effect of Inserting Active Filter
Condition: VCC = 3 V, fin = 40 MHz, fm = 2 MHz (sine wave), mod. = 80%, VIN = -40 dBm
Without Active Filter
Test Circuit
With Active Filter (fc = 3 MHz)
Test Circuit
3 k
1000 pF
3 k
3 k
10 pF
1 k
1 k
3 k
1000 pF
10 pF
33 pF
COMP V
COMP V
CC
CC
2.2 k
2.2 k
15 pF
RSSI Buffer Out 2 (0.1V/div)
RSSI Buffer Out 2 (0.1V/div)
Data Comparator Out (1V/div)
Data Comparator Out (1V/div)
0.2 µs/div
0.2 µs/div
January 2000 TOKO, Inc.
Page 15
TK14551V
TYPICAL PERFORMANCE CHARACTERISTICS (CONT.)
TA = 25 °C, unless otherwise specified.
RSSI Buffer Output (Pin 17) Transient Response (IF Input ON/OFF)
RSSI BUFFERED
OUTPUT-1
C
5.6 k
Condition
V
= 3 V
CC
= 40 MHz
f
in
• C = 100 pF
0 dBm input
-30 dBm input
-60 dBm input
RSSI BUFFERED OUTPUT-1
(0.5V/div)
SG GATE PULSE
(1V/div)
2 µs/div
2 µs/div
• C = 1000 pF
0 dBm input
-30 dBm input
RSSI BUFFERED OUTPUT-1
(0.5V/div)
-60 dBm input
SG GATE PULSE
(1V/div)
5 µs/div
5 µs/div
• C = 0.01 µF
0 dBm input
-30 dBm input
RSSI BUFFERED OUTPUT-1
(0.5V/div)
-60 dBm input
SG GATE PULSE
(1V/div)
50 µs/div
50 µs/div
Page 16
January 2000 TOKO, Inc.
TK14551V
TYPICAL PERFORMANCE CHARACTERISTICS (CONT.)
TA = 25 °C, unless otherwise specified.
RSSI Buffer Output-1 (Pin 17) Transient Response (Battery Save ON OFF)
RSSI BUFFERED
OUTPUT-1
C
5.6 k
Condition
V
= 3 V
CC
= 40 MHz
f
in
• C = 100 pF
0 dBm input
-30 dBm input
-60 dBm input
RSSI BUFFERED OUTPUT-1
(0.5V/div)
Battery Save
(1V/div)
2 µs/div
• C = 1000 pF
0 dBm input
-30 dBm input
RSSI BUFFERED OUTPUT-1
(0.5V/div)
-60 dBm input
Battery Save
(1V/div)
5 µs/div
• C = 0.01 µF
0 dBm input
-30 dBm input
RSSI BUFFERED OUTPUT-1
(0.5V/div)
-60 dBm input
Battery Save
(1V/div)
50 µs/div
January 2000 TOKO, Inc.
Page 17
TK14551V
APPLICATION NOTES
If the input is FM or FSK modulation, whether the IF input is a balanced or an unbalanced input, there is no problem. But,
if the input is ASK modulation and the IF input is a balanced input, the Bit Error Rate (BER) may be high. Therefore, if
theinputisASKmodulation, theIFinputmustbeanunbalancedinput. Iftheinputisanunbalancedinputasshownbelow,
donotterminatePin1(donotconnectthebypasscapacitorbetweenPin1andGND). IfPin23istheinputdonotterminate
Pin 2.
do not terminate
1.5 k
50 k
1.5 k
50 k
50
~
Page 18
January 2000 TOKO, Inc.
TK14551V
CIRCUIT DESCRIPTION
IF Limiter Amplifier:
The IF limiter amplifier is composed of four differential gain stages. The total gain of the IF limiter amplifier is about 64
dB. TheoutputsignaloftheIFlimiteramplifierisprovidedatPin3throughtheemitter-followeroutputstage. TheIFlimiter
amplifier output level is 0.5 VP-P
.
The operating current of the IF limiter amplifier emitter-follower output is 550 µA. If the capacitive load is heavy, the
negative half cycle of the output waveform may be distorted. This distortion can be reduced by connecting an external
resistor between Pin 3 and GND to increase the operating current. The increased operating current by using an external
resistor is calculated as follows (see Figure 1):
V
CC
IF OUTPUT
R
e
I
e
FIGURE 1
The increased operating current Ie (mA) = (VCC - 1.0)/Re (kΩ).
Because the IF input is a balanced input, it is easy to match a SAW filter, etc.
If the IF input is an unbalanced input, connect Pin 23 or 24 with a bypass capacitor to ground.
The input resistance of the IF limiter amplifier is 1.5 kΩ (see Figure 2). If the impedance of the filter is lower than 1.5 kΩ,
connect an external resistor between Pin 24 and Pin 2 or between Pin 23 and Pin 1 in parallel to provide the equivalent
load impedance of the filter. Figure 2 shows an example of a filter with a 330 Ω impedance.
23,
24
1.5 K
330
1, 2
FIGURE 2
January 2000 TOKO, Inc.
Page 19
TK14551V
CIRCUIT DESCRIPTION
The input impedance of the IF limiter amplifier (between Pin 23, 24 and GND) is as follows:
S11
Ω
FREQUENCY
(MHz)
Zin [ ]
(series impedance)
φ
-3.4
-4.2
-5.2
-7.6
-8.0
-8.3
-9.2
-10.0
|S11|
30
40
50
60
70
80
90
100
0.932
0.928
0.930
0.939
0.933
0.926
0.920
0.916
831-j701
683-j667
538-j672
294-j613
285-j574
287-j537
255-j490
230-j450
+ j50
+ j200
+ j150
+ j300
+ j25
+ j100
+ j500
+ j100
+ j75
+ j50
+ j10
0
+ j250
175
250
400
850
10
25
50
100
250
0
S11
30 MHz
S11
magnified
- j250
- j10
- j50
- j75
- j100
100 MHz
- j500
- j25
- j100
- j150
- j300
- j200
- j50
Page 20
January 2000 TOKO, Inc.
TK14551V
CIRCUIT DESCRIPTION
RSSI, RSSI Buffer Amplifier:
Because the RSSI output of this product is a dual output, it has various uses. Because it includes a dual high-speed RSSI
output, it is possible to sense the carrier level and to demodulate AM at the same time.
The RSSI output is a current output. It converts to a voltage by an external resistor between Pin 28,19 and GND. The
time constant of the RSSI output is determined by the product of the external converting resistor and parallel capacitor.
When the time constant is longer, the RSSI output is more immune to disturbances or the component of amplitude
modulation, but the RSSI output response is lower. Determine the external resistor and capacitor with this in mind.
It is possible to modify the slope of the RSSI curve characteristic by changing the external resistor. In this case, the
maximum range of converted RSSI output voltage is GND level to about VCC - 0.2 V (the supply voltage minus the collector
saturation voltage of the output transistor).
In addition, it is possible to modify the temperature characteristic of the RSSI output voltage by changing the temperature
characteristic of the external resistor. Normally, the temperature characteristic of the RSSI output voltage is very stable
when using a carbon resistor or metal film resistor with a temperature characteristic of 0 to 200 ppm/ °C.
This product is very accurate, because the RSSI characteristic is trimmed individually.
Both systems of RSSI output are connected to individual buffer amplifiers with an internal gain of 1. Therefore, even if
the load impedance is heavy, it is possible to take out the RSSI output signal from the buffer amplifier output. The
maximum input and output level of this buffer amplifier is VCC - 1.0 V.
V
CC
OUTPUT
CURRENT
18,
19
RSSI- OUT
Current-to-Voltage Transformation Resistor
FIGURE 3 - RSSI OUTPUT STAGE
AM Demodulation by Using the RSSI Output:
Although the distortion of the RSSI output is high because it is a logarithmic detection of the envelope to the IF input, AM
can be demodulated simply by using the RSSI output. In this case, the input dynamic range that can demodulate AM
is the inside of the linear portion of the RSSI curve characteristic (see Figure 4).
This method does not have a feedback loop to control the gain because an AGC amplifier is not necessary (unlike the
popularly used AM demodulation method). Therefore, it is a very useful application for some uses because it doesn’t
have the response time problem.
January 2000 TOKO, Inc.
Page 21
TK14551V
CIRCUIT DESCRIPTION
Figure 4 shows the AM demodulated waveform.
RSSI-OUT (V)
Operating Condition:
AM can be
demodulated
inside of linear
range
VCC = 3 V, fin = 40 MHz,
fm = 2 MHz, Mod = ±80%,
VIN = -40 dBm
50 mV/div
0.2 µs/div
RF INPUT - LEVEL (dBu)
FIGURE 4 -AM DEMODULATED WAVEFORM
If it is necessary to improve the distortion of the AM demodulated waveform of logarithmic detection, connect a low pass
filter to the RSSI buffer amplifier output. Figure 5 shows the AM demodulated waveform with a low pass filter inserted.
TEST CIRCUIT
Operating Condition:
VCC = 3 V, fin = 40 MHz,
fm = 2 MHz, Mod = ±80%,
3 k
3 k
C
VIN = -40 dBm
1 k
10 pF
33 pF
50 mV/div
COMP V
CC
0.2 µs/div
2.2 k
2.2 k
15 pF
fc = 3 MHz
FIGURE 5
Page 22
January 2000 TOKO, Inc.
TK14551V
CIRCUIT DESCRIPTION
FM Detector:
The FM detector is included in the quadrature FM detector using a Gilbert multiplier.
It is suitable for high speed data communication because the demodulation bandwidth is over 1 MHz.
The phase shifter is connected between Pin 3 (IF limiter output) and Pin 4 (input detector). Any available phase shifter
can be used: a LC resonance circuit, a ceramic discriminator, a delay line, etc.
Figure 6 shows the internal equivalent circuit of the detector.
V
CC
V
V
CC
CC
QB
QA
multiplier core circuit
FIGURE 6 - DETECTOR INTERNAL EQUIVALENT CIRCUIT
The signal from the phase shifter is applied to the multiplier (in the dotted line) through emitter-follower stage QA. When
the phase shifter is connected between pin 3 and pin 4, note that the bias voltage to pin 4 should be provided from an
external source because pin 4 is only connected to the base of QA.
Because the base of QB (at the opposite side) is connected with the supply voltage, Pin 4 has to be biased with the
equivalent voltage.
Using an LC resonance circuit is not a problem (see Figure 7). However, when using a ceramic discriminator, it is
necessary to pay attention to bias. If there is a difference of the base voltages, the DC voltages of the multiplier do not
balance. It alters the DC zero point or worsens the distortion of demodulation output.
The Pin 4 input level should be saturated at the multiplier; if this level is lower, it is easy to disperse the modulation output.
Therefore, to have stable operation, Pin 4 should be higher than 100 mVP-P
.
The following figures show examples of the phase shifter.
Rz is the characteristic impedance
V
CC
V
V
CC
CC
Rz
Rz
Delay
Line
LC resonance circuit
ceramic discriminator
delay line
FIGURE 7 - EXAMPLES OF PHASE SHIFTERS
January 2000 TOKO, Inc.
Page 23
TK14551V
CIRCUIT DESCRIPTION
Establishing Demodulation Characteristics:
Generally, demodulation characteristics of FM detectors are determined by the external phase shifter. However, this
product has a unique function which can optionally establish the demodulation characteristics by the time constant of the
circuit parts after demodulation. The following explains this concept.
Figure 8 shows the internal equivalent circuit of the detector output stage.
The multiplier output current of the detector is converted to a voltage by the internal OP AMP. The characteristic of this
stage is determined by converting the current to voltage with resistor R0 and the capacitor C0 connected between Pin 8
and Pin 9 (see Figure 8).
In other words, the slope of the S-curve characteristic can be established optionally with resistor R0 without changing the
constant of the phase shifter. The demodulated bandwidth can be established optionally by the time constant of this
external resistor R0 and capacitor C0 inside of a bandwidth of the IF-filter and phase shifter. Figure 9 shows an example
of this characteristic.
V
ref
The -3 dB frequency Fc is calculated by the following:
I to V convertor
1
Fc =
2 π C0R0
io
The S-curve output voltage is calculated by the following
as centering around the internal reference voltage Vref:
VOUT = Vref ± io X R0
R
C
0
0
Demodulated
Output Current
Demodulated
Output Voltage
V
OUT
Where Vref = 1.4 V, maximum of current io = ±100 µA
FIGURE 8 - INTERNAL EQUIVALENT CIRCUIT OF DETECTOR OUTPUT STAGE
2
0 dB = 30.7 mVrms
C = none
0
-2
C = 330 pF
Operating Condition:
-4
C = 1000 pF
Measured by the standard test circuit.
Parallel resistor to phase shift coil = 1 kΩ.
fIN = 10.7 MHz, modulation = ±100 kHz.
External capacitance C0 = 0 ~ 1000 pF.
-6
-8
C =
V
= 3 V
CC
10 pF
fin = 10.7 MHz
dev. = 100 kHz
C =
47 pF
-10
-12
1k
3k 10k 30k 100k 300k 1M
MODULATING FREQUENCY fm (Hz)
FIGURE 9 - EXAMPLE: BAND WIDTH OF DEMODULATION VS. TIME CONSTANT CHARACTERISTIC
Page 24
January 2000 TOKO, Inc.
TK14551V
CIRCUIT DESCRIPTION
Center Voltage of Detector DC Output:
The center voltage of the detector DC output is determined by the internal reference voltage source. It is impossible to
change this internal reference voltage source, but it is possible to change the center voltage by the following method.
As illustrated in Figure 10, the demodulated output current at Pin 8 is converted to the voltage by an external resistor R1,
without using the internal OP AMP.
Figure 11 shows an example of a simple circuit that divides the supply voltage into halves using resistors. Since both
circuits have a high output impedance, an external buffer amplifier should be connected.
V
ref
I to V convertor
Demodulated Output Voltage VOUT = VB ± R1 x io
1
Fc =
Demodulated Bandwidth
io
2 π C1(1/gm)
Demodulated
Output Current
1/gm is approximately 50 kΩ which is the output resistance of the
multiplier.
Pin 9 is disconnected.
VB
Demodulated
C1
R1
Output Voltage
V
OUT
FIGURE 10 - EXAMPLE OF USING EXTERNAL REFERENCE SOURCE
Demodulated Output Voltage VOUT = VCC/ 2 ± R1 x io
V
CC
Demodulated
1
R1
R2
Fc =
Demodulated Bandwidth
Output Voltage
V
2 π C1(1/gm)
OUT
1/gm is approximately 50 kΩ, which is the output resistance of the
C1
multiplier.
Pin 9 is disconnected.
FIGURE 11 - EXAMPLE OF DIVIDING SUPPLY VOLTAGE INTO HALVES BY RESISTORS
January 2000 TOKO, Inc.
Page 25
TK14551V
CIRCUIT DESCRIPTION
RSSI Comparator, Data Comparator:
The TK14551V contains a general purpose high speed data comparator and RSSI comparator for the base band
processing.
Because the input stage is composed of PNP transistors, it is possible to operate from a minimum voltage of 0.1 V to
the supply voltage - 1.0 V (see Figure 12).
Moreover, since the HFE of this PNP transistor is over 100, the bias current is below 0.01 µA (this is below the value of
the competitors products which typically use a lateral PNP transistor at the input stage).
INPUT STAGE
FIGURE 12 - COMPARATOR INPUT STAGE
Figure 13 shows the internal equivalent circuit of the comparator output stage. Because the comparator output is an open
collector, it is suitable for many interface levels. This open collector output is connected with an electrostatic discharge
protection diode at the GND side only; it is not connected with it at the power supply side in consideration of operating
the voltage over the supply voltage of this IC.
When the collector pull-up resistor value is low, high operating currents result. To prevent interference to the other
circuitry, the emitters of the output transistors are brought out independently at Pins 14 and 15.
Pins 14 and 15 are not connected with the substrate and other GNDs internal to the IC. Therefore, when operating these
comparators, these terminals must be connected to GND.
When these comparators are operating at high speed, the etch pattern of Pins 13, 14, 15, and 16 (comparator output
stages) should not be run close to the etch pattern of Pins 23 and 24 (IF inputs). The switching waveforms of the
comparator outputs may have an effect on the IF inputs and may add noise to the zero crossing of the demodulated
waveform, resulting in cross over distortion.
V
CC
13,
16
V
CC
14,
15
COMPARATOR
OUTPUT STAGE
FIGURE 13 - COMPARATOR OUTPUT STAGE
Because the negative input of the RSSI comparator is connected to the RSSI buffer amplifier output-1 internally, it is used
for carrier sensing.
The data comparator is used for the data shaper.
Page 26
January 2000 TOKO, Inc.
TK14551V
CIRCUIT DESCRIPTION
Battery Save Function:
Pin 21 is the control terminal for the battery save function. The ON/OFF operation of the whole IC can be switched by
controlling the DC voltage at this terminal. Figure 14 shows the internal equivalent circuit of Pin 21.
Because it switches the bias circuit of the whole IC using the transistor in standby mode, it reduces the supply current
to near zero. As the input terminal is connected with an electrostatic discharge protection diode at GND side only, it is
possible to control the voltage above the supply voltage. It is possible to go into standby mode by disconnecting Pin 21,
but it is not recommended because Pin 21 is a high impedance and may malfunction from an external disturbance.
When Pin 21 is disconnected, a suitable capacitor should be connected between Pin 21 and GND.
V
CC
BIAS
50 K
21
Vs
FIGURE 14 - BATTERY SAVE
Application of ASK(Amplitude Shift Keying) Demodulation:
Figure 15 shows an example application of ASK demodulation.
If the application circuit is like Figure 15, the transient response time is long because of the time constant of the rectifier
(Pin 12) of the data comparator input.
On the other hand, if the circuit construction between the RSSI buffer amplifier output-2 (Pin 10) and the data comparator
input is Figure 16, the transient response time is shortened. Since the demodulation is a logarithmic detection using the
RSSI output, the demodulated wave of the RSSI buffer amplifier output-2 is distorted making the duty ratio of the data
comparator output worse. The output duty ratio may be improved by adding the offset DC voltage (Vs) to the DC voltage
of Pin 11 of the data comparator input. Vs is established at a few tens of mV. But, as the demodulation level of the RSSI
buffer amplifier output-2 is changed by the dispersion, it is best to control Vs by a variable resistor, etc. It is possible to
substitute the variable resistor for Vs.
January 2000 TOKO, Inc.
Page 27
TK14551V
CIRCUIT DESCRIPTION
Comp V
CC
= 3 V
0.01 µF
10 µF
1 k
1 k
B.S. = 1.5 V
2200 pF
5.6 K
SG1
50
2200 pF
51
5.6 K
100 pF
~
BIAS
IF
AMP
RSSI
V
V
CC
CC
330 pF
2200 pF
0.01 µF 0.01 µF
2200 pF
3 K
3 K
0.01 µF
10 µF
0.01 µF
V
47 µF
CC = 3 V
FIGURE 15
Comp V
CC
= 3 V
0.01 µF
10 µF
1 k
1 k
B.S. = 1.5 V
2200 pF
5.6 K
SG1
50
2200 pF
5.6 K
100 pF
51
~
BIAS
IF
AMP
RSSI
V
V
CC
CC
V
V
2200 pF
CC
CC
0.01 µF 0.01 µF
2200 pF
100 pF
100 K
100 K
0.01 µF
10 µF
0.01 µF
Vs
V
47 µF
CC = 3 V
FIGURE 16
Page 28
January 2000 TOKO, Inc.
TK14551V
TEST BOARD
L1
C1= 2200 pF, C2 = 10 µF, C3 = 0.01 µF, C4 = 1 pF, C5 = 1000 pF, C6 = 100 pF
R1 = 50 Ω, R2 = 2.2 kΩ, R3 = 22 kΩ, R4 = 1 kΩ, R5 = 5.6 kΩ
L1 = 10 µH, L2 = 836BH-0268 (TOKO)
January 2000 TOKO, Inc.
Page 29
TK14551V
NOTES
Page 30
January 2000 TOKO, Inc.
TK14551V
NOTES
January 2000 TOKO, Inc.
Page 31
TK14551V
PACKAGE OUTLINE
Marking Information
TSSOP-24
TK14551V
14551
0.35
Marking
13
24
AAAAA
YYY
e
0.65
Recommended Mount Pad
1
12
Lot. No.
7.8
0.50
e 0.65
+0.15
-0.15
0.25
0.1
6.4 +
0.3
M
0.12
Dimensions are shown in millimeters
Tolerance: x.x = ± 0.2 mm (unless otherwise specified)
Toko America, Inc. Headquarters
1250 Feehanville Drive, Mount Prospect, Illinois 60056
Tel: (847) 297-0070 Fax: (847) 699-7864
TOKO AMERICA REGIONAL OFFICES
Midwest Regional Office
Toko America, Inc.
1250 Feehanville Drive
Mount Prospect, IL 60056
Tel: (847) 297-0070
Western Regional Office
Toko America, Inc.
2480 North First Street , Suite 260
San Jose, CA 95131
Tel: (408) 432-8281
Fax: (408) 943-9790
Eastern Regional Office
Toko America, Inc.
107 Mill Plain Road
Danbury, CT 06811
Tel: (203) 748-6871
Fax: (203) 797-1223
Semiconductor Technical Support
Toko Design Center
4755 Forge Road
Colorado Springs, CO 80907
Tel: (719) 528-2200
Fax: (719) 528-2375
Fax: (847) 699-7864
Visit our Internet site at http://www.tokoam.com
The information furnished by TOKO, Inc. is believed to be accurate and reliable. However, TOKO reserves the right to make changes or improvements in the design, specification or manufacture of its
products without further notice. TOKO does not assume any liability arising from the application or use of any product or circuit described herein, nor for any infringements of patents or other rights of
third parties which may result from the use of its products. No license is granted by implication or otherwise under any patent or patent rights of TOKO, Inc.
Page 32
January 2000 TOKO, Inc.
© 1999 Toko, Inc.
IC-119-TK119xx
0798O0.0K
Printed in the USA
All Rights Reserved
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