ATR4251C-PFQY [MICROCHIP]
Consumer Circuit, BICMOS;
| 型号： | ATR4251C-PFQY |
| 厂家： | 
MICROCHIP |
| 描述： | Consumer Circuit, BICMOS 信息通信管理 商用集成电路 |
| 文件： | 总21页 (文件大小：1135K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
ATR4251C
Low-noise, High-dynamic-range AM/FM Antenna
Amplifier IC
DATASHEET
Features
● High dynamic range for AM and FM
● Integrated AGC for AM and FM
● High intercept point 3rd order for FM
● FM amplifier adjustable to various cable impedances
● High intercept point 2nd and 3rd order for AM
● Low noise output voltage
● Low power consumption
● Low output impedance AM
9258D-AUDR-08/14
1.
Description
The Atmel® ATR4251C is an integrated low-noise AM/FM antenna amplifier with integrated AGC in BiCMOS2S technology.
The device is designed in particular for car applications, and is suitable for windshield and roof antennas.
Figure 1-1. Block Diagram QFN24 Package
FM
FM
FM
AGC
IN
VREF1 IN GAIN GND2 OUT
Paddle = GND
24
23
22
21
20
19
FM
NC*
GND
NC*
amplifier
1
2
3
4
5
6
18
17
16
15
14
13
VS
BAND
GAP
AGC1
AGC2
VREF2
AMIN
AGC
AGCCONST
VREF4
AMOUT1
GND1
AM
7
AGC
(AM)
8
9
10
11
12
CREG AGC AGC
T
NC*
NC*
AMIN AM CONST
* Pin must not be connected to any other pin or supply chain except GND.
Figure 1-2. Block Diagram SSO20 Package
FMGAIN
FMIN
1
20 GND2
FM
amplifier
2
19 FMOUT
18 AGCIN
17 VS
VREF1
GND
3
4
5
6
7
8
9
AGC
AGC1
AGC2
VREF2
AMIN1
CREG
16 AGCCONST
15 VREF4
14 AMOUT1
13 GND1
Band
gap
AM
12 TCONST
11 AGCAM
AGC
(AM)
AGCAMIN 10
SSO20
2
ATR4251C [DATASHEET]
9258D–AUDR–08/14
2.
Pin Configuration
Figure 2-1. Pinning QFN24
24 23 22 21 20 19
18
NC
GND
AGC1
AGC2
VREF2
AMIN
NC
1
2
3
4
5
6
17 VS
16 AGCCONST
15
14
13
VREF4
AMOUT1
GND1
7
8
9 10 11 12
Table 2-1. Pin Description QFN24
Pin
1
Symbol
NC
Function
Pin must not be connected to any other pin or supply chain except GND.
2
GND
Ground FM
3
AGC1
AGC2
VREF2
AMIN
AGC output for pin diode
4
AGC output for pin diode
5
Reference voltage for pin diode
6
AM input, impedance matching
7
NC
Pin must not be connected to any other pin or supply chain except GND
8
CREG
AGCAMIN
AGCAM
TCONST
NC
AM - AGC time constant capacitance 2
9
AM - AGC input
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
Paddle
AM - AGC output for pin diode
AM - AGC - time constant capacitance 1
Pin must not be connected to any other pin or supply chain except GND
GND1
AMOUT1
VREF4
AGCCONST
VS
Ground AM
AM output, impedance matching
Bandgap
FM AGC time constant
Supply voltage
NC
Pin must not be connected to any other pin or supply chain except GND
AGCIN
FMOUT
GND2
FMGAIN
FMIN
FM AGC input
FM output
Ground
FM gain adjustment
FM input
VREF1
GND
Reference voltage 2.7V
Ground Paddle
ATR4251C [DATASHEET]
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9258D–AUDR–08/14
Figure 2-2. Pinning SSO20
FMGAIN
FMIN
VREF1
GND
AGC1
AGC2
VREF2
AMIN1
CREG
1
2
3
4
5
6
7
8
9
10
20
19
18
17
16
15
14
13
12
11
GND2
FMOUT
AGCIN
VS
AGCCONST
VREF4
AMOUT1
GND1
TCONST
AGCAM
AGCAMIN
Table 2-2. Pin Description SSO20
Pin
1
Symbol
FMGAIN
FMIN
Function
FM gain adjustment
FM input
2
3
VREF1
GND
Reference voltage 2.7V
FM ground
4
5
AGC1
AGC output for PIN diode
AGC output for PIN diode
6
AGC2
7
VREF2
AMIN1
CREG
Reference voltage for PIN diode
AM input, impedance matching
AM AGC constant capacitance 2
AM input, AM AGC
8
9
10
11
12
13
14
15
16
17
18
19
20
AGCAMIN
AGCAM
TCONST
GND1
AM AGC output for PIN diode
AM AGC constant capacitance 1
AM ground
AMOUT1
VREF4
AGCCONST
VS
AM output, impedance matching
Band gap 6V
FM AGC constant
Supply voltage
AGCIN
FMOUT
GND2
FM AGC input
FM output
FM ground
4
ATR4251C [DATASHEET]
9258D–AUDR–08/14
3.
Functional Description
The Atmel® ATR4251C is an integrated AM/FM antenna impedance matching circuit. It compensates cable losses between
the antenna (for example windshield, roof, or bumper antennas) and the car radio which is usually placed far away from the
antenna.
AM refers to the long wave (LW), medium wave (MW) and short wave (SW) frequency bands (150kHz to 30MHz) that are
usually used for AM transmission, and FM means any of the frequency bands used world-wide for FM radio broadcast
(70MHz to 110MHz).
Two separate amplifiers are used for AM and FM due to the different operating frequencies and requirements in the AM and
FM band. This allows the use of separate antennas (for example, windshield antennas) for AM and FM. Of course, both
amplifiers can also be connected to one antenna (for example, the roof antenna).
Both amplifiers have automatic gain control (AGC) circuits in order to avoid overdriving the amplifiers under large-signal
conditions. The two separate AGC circuits prevent strong AM signals from blocking FM stations, and vice versa.
3.1
AM Amplifier
Due to the long wavelength in AM bands, the antennas used for AM reception in automotive applications must be short
compared to the wavelength. Therefore these antennas do not provide 50Ω output impedance, but have an output
impedance of some pF. If these (passive) antennas are connected to the car radio by a long cable, the capacitive load of this
cable (some 100pF) dramatically reduces the signal level at the tuner input.
In order to overcome this problem, Atmel ATR4251C provides an AM buffer amplifier with low input capacitance (less than
2.5pF) and low output impedance (5Ω). The low input capacitance of the amplifier reduces the capacitive load at the
antenna, and the low impedance output driver is able to drive the capacitive load of the cable. The voltage gain of the
amplifier is close to 1 (0dB), but the insertion gain that is achieved when the buffer amplifier is inserted between antenna
output and cable may be much higher (35dB). The actual value depends, of course, on antenna and cable impedance.
The input of the amplifier is connected by an external 4.7MΩ resistor to the bias voltage (pin 7, SSO20) in order to achieve
high input impedance and low noise voltage.
AM tuners in car radios usually use PIN diode attenuators at their input. These PIN diode attenuators attenuate the signal by
reducing the input impedance of the tuner. Therefore, a series resistor is used at the AM amplifier output in the standard
application. This series resistor guarantees a well-defined source impedance for the radio tuner and protects the output of
the AM amplifier from short circuit by the PIN diode attenuator in the car radio.
3.2
AM AGC
The IC is equipped with an AM AGC capability to prevent overdriving of the amplifier in case the amplifier operates near
strong antenna signal level, for example, transmitters.
The AM amplifier output AMOUT1 is applied to a resistive voltage divider. This divided signal is applied to the AGC level
detector input pin AGCAMIN. The rectified signal is compared against an internal reference. The threshold of the AGC can
be adjusted by adjusting the divider ratio of the external voltage divider. If the threshold is reached, pin AGCAM opens an
external transistor which controls PIN diode currents and limits the antenna signal and thereby prevents overdriving the AM
amplifier IC.
3.3
FM Amplifier
The FM amplifier is realized with a single NPN transistor. This allows use of an amplifier configuration optimized on the
requirements. For low-cost applications, the common emitter configuration provides good performance at reasonable bills of
materials (BOM) cost(1). For high-end applications, common base configuration with lossless transformer feedback provides
a high IP3 and a low noise figure at reasonable current consumption(2). In both configurations, gain, input, and output
impedance can be adjusted by modification of external components.
The temperature compensated bias voltage (VREF1) for the base of the NPN transistor is derived from an integrated band
gap reference. The bias current of the FM amplifier is defined by an external resistor.
Notes: 1. See test circuit (Figure 8-1 on page 11)
2. See application circuit (Figure 9-1 on page 12)
ATR4251C [DATASHEET]
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9258D–AUDR–08/14
3.4
FM/TV AGC
The IC is equipped with an AGC capability to prevent overdriving the amplifier in cases when the amplifier is operated with
strong antenna signals (for example, near transmitters).
It is possible to realize an external TV antenna amplifier with integrated AGC and external RF transistor. The bandwidth of
the integrated AGC circuit is 900MHz.
FM amplifier output FMOUT is connected to a capacitive voltage divider and the divided signal is applied to the AGC level
detector at pin AGCIN. This level detector input is optimized for low distortion. The rectified signal is compared against an
internal reference. The threshold of the AGC can be adjusted by adjusting the divider ratio of the external voltage divider. If
the threshold is reached, pin AGC1 opens an external transistor which controls the PIN diode current, this limits the amplifier
input signal level and prevents overdriving the FM amplifier.
6
ATR4251C [DATASHEET]
9258D–AUDR–08/14
4.
Absolute Maximum Ratings
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. This is a stress rating
only and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of this
specification is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.
Reference point is ground (pins 4 and 13 for SSO20 and pins 2, 13, 21 and Paddle for QFN24 package).
Parameters
Symbol
Value
12
Unit
V
Supply voltage
VS
Power dissipation, Ptot at Tamb = 90°C
Junction temperature
Ptot
550
mW
°C
°C
°C
°C
V
Tj
Tamb
150
Ambient temperature SSO20 package
Ambient temperature QFN24 package
Storage temperature
–40 to +90
–40 to +105
–50 to +150
±2000
Tamb
Tstg
Pins 1 to 19, 21 and 24
Pins 20, 22 and 23
Pins 2 to 18
Pins 1, 19 and 20
All pins
ESD HMB QFN24
±1500
V
±2000
V
ESD HMB SSO20
ESD MM
±1500
V
±200
V
5.
Thermal Resistance
Parameters
Symbol
Value
Unit
Junction ambient, soldered on PCB, dependent on
PCB Layout for SSO 20 package
RthJA
92
K/W
Junction ambient, soldered on PCB, dependent on
PCB Layout for QFN package
RthJA
40
K/W
6.
Operating Range
Parameters
Symbol
VS
Min.
8
Typ.
Max.
11
Unit
V
Supply voltage
10
Ambient temperature SSO20 package
Ambient temperature QFN 24 package
Tamb
–40
–40
+90
+105
°C
°C
Tamb
ATR4251C [DATASHEET]
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9258D–AUDR–08/14
7.
Electrical Characteristics
See Test Circuit, Figure 8-1 on page 11; VS = 10V, Tamb = 25°C, unless otherwise specified. Pin numbers in () are referred to the QFN
package.
No. Parameters
Test Conditions
Pin
Symbol
Min.
Typ.
Max.
Unit
Type*
1.1 Supply currents
17 (17)
IS
11
14
17
mA
A
Reference voltage 1
output
1.2
Ivref1 = 1mA
3 (24)
7 (5)
VRef1
VRef2
VRef4
2.65
0.38VS
6.0
2.8
0.4VS
6.35
2.95
0.42VS
6.7
V
V
V
A
B
A
Reference voltage 2
output
1.3
Reference voltage 4
output
1.4
Ivref4 = 3mA
15 (15)
2
AM Impedance Matching 150kHz to 30MHz (The Frequency Response from Pin 8 to Pin 14)
2.1 Input capacitance
f = 1MHz
8 (6)
8 (6)
CAMIN
2.2
2.45
2.7
40
8
pF
nA
Ω
D
C
D
2.2 Input leakage current Tamb = 85°C
2.3 Output resistance
14 (14)
ROUT
A
4
5
8/14
(6/14)
2.4 Voltage gain
f = 1MHz
0.94
0.97
1
A
Pin 14 (14), R78 = 4.7MΩ,
B = 9kHz, CANT = 30pF
150kHz
200kHz
500kHz
Output noise voltage
(rms value)
VN1
VN2
VN3
VN4
–8
–9
–11
–12
–6
–7
–9
dBµV
dBµV
dBµV
d B µ V
2.5
14
C
1MHz
–10
Vs = 10V, 50Ω load,
fAMIN = 1MHz, input
voltage = 120dBµV
2.6 2nd harmonic
2.7 3rd harmonic
AMOUT1
AMOUT1
–60
–53
–58
–50
dBc
dBc
C
C
Vs = 10V, 50Ω load,
fAMIN = 1MHz, input
voltage = 120dBµV
3
AM AGC
3.1 Input resistance
3.2 Input capacitance
10 (9)
10 (9)
RAGCAMIN
CAGCAMIN
40
50
kΩ
D
D
f = 1MHz
f = 1MHz
2.6
3.2
3.8
79
pF
AGC input voltage
threshold
3.3
10 (9)
VAMth
75
10
77
dBµV
MHz
V
B
D
A
A
C
A
AGC threshold increased
by 3dB
3.4 3 dB corner frequency
Minimal AGCAM
3.5
ViHF = 90dBµV at pin 10
(9)
10/11
(9/10)
VAGC
VAGC
VAGC
IAMsink
VS – 2.4 VS – 2.1 VS – 1.7
VS – 0.2 VS – 0.1
output voltage
Maximal AGCAM
3.6
10/11
(9/10)
ViHF = 0V at pin 10 (9)
V
output voltage
Maximal AGCAM
3.7
ViHF = 0V at pin 10 (9)
T = +85°C
10/11
(9/10)
VS – 0.4 VS – 0.3
V
output voltage(1)
Maximum AGC sink
current
ViHF = 0V at pin 10 (9)
U (pin 12 (11)) = 2V
3.8
12 (11)
–150
–120
–90
µA
*) Type means: A = 100% tested, B = 100% correlation tested, C = Characterized on samples, D = Design parameter
Notes: 1. Leakage current of PIN diode can be adjusted by an external resistor between pin 11 and VS
2. Demo board measurements (see Figure 8-1 on page 11 “Common Emitter Configuration”)
3. Demo board measurements (see Figure 9-1 on page 12 “Common Base Configuration”)
8
ATR4251C [DATASHEET]
9258D–AUDR–08/14
7.
Electrical Characteristics (Continued)
See Test Circuit, Figure 8-1 on page 11; VS = 10V, Tamb = 25°C, unless otherwise specified. Pin numbers in () are referred to the QFN
package.
No. Parameters
Test Conditions
Pin
Symbol
Min.
Typ.
Max.
Unit
Type*
IAM sin k
-------------------
VAMth
Transconductance of
Level detector
10/12
(9/11)
µA
mVrms
---------------
3.9
ViHF = VAMth at pin 10 (9)
20
C
Figure 9-2 on page 13,
1MHz and 1.1MHz,
120dBµV
IP3 at level detector
input
3.10
3.11
10 (9)
150
27
170
dBµV
D
PIN diode current
generation
d(20 log IPin-diode) / dUPin12
T = 25°C, UPin12 = 2V
30
35
dB/V
D
D
3.12 Output resistance
FM Amplifier
9 (8)
ROUT
45
kΩ
4
4.1 Emitter voltage
4.2 Emitter voltage
4.3 Supply current limit
1 (22)
1 (22)
1.85
1.8
1.95
2.0
2.05
2.2
37
V
V
A
C
D
T = –40°C to +85°C
Rε = 56Ω
19 (20)
I19
mA
Maximum output
voltage
4.4
VS = 10V
19 (20)
12
Vpp
D
4.5 Input resistance
4.6 Output resistance
f = 100MHz
f = 100MHz
2 (23)
RFMIN
50
50
Ω
Ω
D
D
19 (20)
RFMOUT
FMOUT/
FMIN
4.7 Power gain(2)
f = 100MHz
G
5
dB
A
D
Output noise voltage
4.8
f = 100MHz, B = 120kHz
19 (20)
19 (20)
VN
–5.1
dBµV
(emitter circuit)(2)
4.9 OIP3 (emitter circuit)(2) f = 98 + 99MHz
4.10 Gain(3)
4.11 Noise figure(3)
IIP3
140
6
dBµV
dB
C
C
C
C
2.8
148
dB
4.12 OIP3(3)
f = 98 + 99MHz
dBµV
Parameters Dependent of External Components in Application Circuit: RFMIN, RFMOUT, G, VN, IIP3
FM AGC
5
f = 100MHz
f = 900MHz
Vth1,100
Vthl,900
81
81
83
85
85
87
dBµV
dBµV
B
B
5.1 AGC threshold
18 (19)
5 (24)
5 (24)
6 (4)
AGC1 active,
Vpin16 (16) = 5V
VS –
2.1V
VS –
1.9V
VS –
1.7V
5.2 AGC1 output voltage
5.3 AGC1 output voltage
5.4 AGC2 output voltage
5.5 AGC2 output voltage
VAGC
VAGC
VAGC
VAGC
V
V
V
V
C
C
C
C
AGC1 inactive,
Vpin16 (16) = 1.7V
VS –
0.2V
VS
AGC2 active,
Vpin16 (16) = 1.7V
VS –
2.1V
VS –
1.9V
VS –
1.7V
AGC2 inactive,
Vpin16 (16) = 5V
VS –
0.2V
6 (4)
VS
5.6 Input resistance
5.7 Input capacitance
18 (19)
18 (19)
RPin18
CPin18
17
21
25
kΩ
D
D
F = 100MHz
1.5
1.75
1.9
pF
*) Type means: A = 100% tested, B = 100% correlation tested, C = Characterized on samples, D = Design parameter
Notes: 1. Leakage current of PIN diode can be adjusted by an external resistor between pin 11 and VS
2. Demo board measurements (see Figure 8-1 on page 11 “Common Emitter Configuration”)
3. Demo board measurements (see Figure 9-1 on page 12 “Common Base Configuration”)
ATR4251C [DATASHEET]
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9258D–AUDR–08/14
7.
Electrical Characteristics (Continued)
See Test Circuit, Figure 8-1 on page 11; VS = 10V, Tamb = 25°C, unless otherwise specified. Pin numbers in () are referred to the QFN
package.
No. Parameters
Test Conditions
Pin
Symbol
Min.
Typ.
Max.
Unit
Type*
Figure 9-2 on page 13,
100MHz and 105MHz,
VGen = 120dBµV
5.8 IP3 at AGC input
18 (19)
150
dBµV
D
900MHz and 920MHz
VGen = 120dBµV
5.9 IP3 at AGC input
18 (19)
16
148
–9
dBµV
µA
D
C
C
5.10 Max. AGC sink current ViHF = 0V
IPin16
–11
0.8
–7
ViHF = Vth1,100
,
dIPin16
dUPin18
/
mA/V
(rms)
5.11 Transconductance
1.0
1.3
dIPin16(16) / dUPin18(19)
UPin16 = 3V,
5.12 Gain AGC1, AGC2
dUPin5(3) / dUPin16(16)
,
0.5
0.56
0.6
C
–dUPin6(4) / dUPin16(16)
*) Type means: A = 100% tested, B = 100% correlation tested, C = Characterized on samples, D = Design parameter
Notes: 1. Leakage current of PIN diode can be adjusted by an external resistor between pin 11 and VS
2. Demo board measurements (see Figure 8-1 on page 11 “Common Emitter Configuration”)
3. Demo board measurements (see Figure 9-1 on page 12 “Common Base Configuration”)
10
ATR4251C [DATASHEET]
9258D–AUDR–08/14
8.
Test Circuit FM/AM
Figure 8-1. Common Emitter Configuration
+
+
4.7Ω
4.7Ω
VS
10µF
10µF
100nF
100nF
470nF 500pF
AMOUT1
5kΩ
AGCIN
GND
150nH
22pF 4.7µF 2.2µF
1nF
47Ω1)
+
+
22pF
FMOUT
2.2nF
270Ω
68Ω
4.7MΩ
1µH
+
+
22Ω
56Ω
2.2nF
1µF
10µF
220nF
33pF
Cant
15nF
2.2nF
2.2nF
FMIN
AMINP1
AMAGCIN
50Ω
50Ω
(1) Output impedance 50Ω adjustment
ATR4251C [DATASHEET]
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9258D–AUDR–08/14
9.
Application Circuit (Demo Board)
Figure 9-1. Common Base Configuration
AM/FM_OUT
+VS
+VS
R23
C30
C21
C26
C23
+
+
4.7Ω
R11(2)
10kΩ
R10
VB+ 10
GND
100nF
2.2µF
100Ω
10µF
100nF
180nH
L3
R24
C17
470nF
C31
R20
C27
C24
4.7Ω
33pF
10µF
100nF
R21
T2
BC858
100Ω
33Ω(1)
2.2pF
(4)
L3
470nH
C19
C12
1nF
C33
C13
100nF
C20
+
AM/FM application combined with AM AGC
with the following capability
C18
1pF(4)
4.7µF
220nF
1. Testing FM + FM AGC
connector FM as input
connector AM/FM_OUT as output
R12(2)
2.2kΩ
2. Testing AM + AM AGC
connector AM as input
connector AM/FM_OUT as output
D3
R3
C28
1pF
1kΩ
BA779-2
C29
6
1
4
3
TR1
2.2nF
C2
2.2nF
R25
68Ω
+VS
R4
D1
D2
4.7MΩ
R6 R5
+
C7
BA679
C5
2.2nF
BA679
C3
C32
10µF
R2
R1
51Ω
47Ω
1µF
100nF
(2)
100Ω
C10
C1
2.2pF
C4
RS1
2Ω
L1
120nH
R7
220nF 15nF
R9
10kΩ(3)
22pF
FM
AM
(2)
C8
T1
R8
BC858
1nF
C6
10nF
3kΩ(3)
C11
100pF
(1) AM Output impedance
(50Ω adjustment)
(2) Leakage current reduction
(3) AM AGC threshold
(4) AM AGC threshold
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ATR4251C [DATASHEET]
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Figure 9-2. Antenna Dummy for Test Purposes
OUTPUT
50Ω
1nF
50Ω
Gen
AGCIN
ATR4251C [DATASHEET]
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10. Internal Circuitry
Table 10-1. Equivalent Pin Circuits (ESD Protection Circuits Not Shown)
PIN SSO20
PIN QFN24
Symbol
Equivalent Circuit
19
1
2
19
22
23
20
FMGAIN
FMIN
FMOUT
1
2
3
24
VREF1
GND
3
4, 13, 20
2, 13, 21
VS
5
6
3
4
AGC1
AGC2
5
1, 7, 12, 18
NC
7
5
VREF2
7
14
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Table 10-1. Equivalent Pin Circuits (ESD Protection Circuits Not Shown) (Continued)
PIN SSO20
PIN QFN24
Symbol
Equivalent Circuit
VS
8
6
AMIN1
8
9
8
CREG
9
10
10
9
AGCAMIN
11
10
AGCAM
11
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9258D–AUDR–08/14
Table 10-1. Equivalent Pin Circuits (ESD Protection Circuits Not Shown) (Continued)
PIN SSO20
PIN QFN24
Symbol
Equivalent Circuit
12
11
TCONS
12
14
14
AMOUT1
14
15
15
15
VREF4
16
16
16
AGCCONST
17
17
VS
16
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Table 10-1. Equivalent Pin Circuits (ESD Protection Circuits Not Shown) (Continued)
PIN SSO20
PIN QFN24
Symbol
Equivalent Circuit
18
18
19
AGCIN
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11. Ordering Information
Extended Type Number
ATR4251C-TKQY
ATR4251C-PFQY
ATR4251C-PFPY
Package
Remarks
MOQ
SSO20
Taped and reeled
Taped and reeled
Taped and reeled
4000 pieces
6000 pieces
1500 pieces
QFN24, 4mm × 4mm
QFN24, 4mm × 4mm
12. Package Information
Figure 12-1. SSO20
5.4 0.2
4.4 0.1
6.75-0.25
6.45 0.15
0.25 0.05
0.65 0.05
5.85 0.05
20
11
10
technical drawings
according to DIN
specifications
Dimensions in mm
1
03/10/04
TITLE
Package: SSO20
DRAWING NO.
REV.
GPC
Package Drawing Contact:
packagedrawings@atmel.com
6.543-5056.01-4
1
18
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Figure 12-2. VQFN 4x4 24L
Bottom
2.6 0.15
Top
24
19
24
7
1
6
18
13
1
6
Pin 1 identification
12
4
0.2
Z
0.5 nom.
0.9 0.1
2.5
technical drawings
according to DIN
specifications
Z 10:1
Dimensions in mm
0.23 0.07
11/28/05
TITLE
DRAWING NO.
6.543-5123.01-4
REV.
GPC
Package Drawing Contact:
packagedrawings@atmel.com
Package: VQFN_4x4_24L
Exposed pad 2.6x2.6
1
ATR4251C [DATASHEET]
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13. Revision History
Please note that the following page numbers referred to in this section refer to the specific revision mentioned, not to this
document.
Revision No.
9258D-AUDR-08/14
History
• Put datasheet in the latest template
• Section 7 “Electrical Characteristics” number 1.1 min. values on page 8 updated
9258C-AUDR-01/14
9258B-AUDR-07/13
• Section 7 “Electrical Characteristics” numbers 1.2, 1.4, 2.4 min., typ. and max.values
on page 8 updated
• Section 4 “Absolute Maximum Ratings” on page 7 updated
20
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X
X X X X
X
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