SM8707F [NPC]
Clock Generator with Dual PLLs;
| 型号： | SM8707F |
| 厂家： | 
NIPPON PRECISION CIRCUITS INC |
| 描述： | Clock Generator with Dual PLLs |
| 文件： | 总12页 (文件大小：380K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
SM8707E/F
Clock Generator with Dual PLLs
OVERVIEW
The 8707E/F are dual-PLL clock generator ICs, using a 27MHz master clock, that generate independent audio clock,
video clock, and signal processor clock outputs needed in DVD player/recorder applications. Each PLL loop filter and
crystal oscillator circuit are built-in and require no external components, resulting in high-precision clocks. The lineup
includes devices that support both 44.1/48kHz audio sampling frequencies (fs), switchable using a control pin. The
sampling frequency can be switched during operation without generating any output spike noise.
FEATURES
■ Supply voltage: 3.0 to 3.6V
■ Low current consumption: 35mA typ.
(VDD=3.3V, all outputs with no load)
■ 27MHz master clock
■ PLL loop filter built-in
■ Crystal oscillator circuit built-in
■ Sampling frequency fs: 44.1/48kHz
■ 16-pin VSOP package (Pb free)
(internal PLL reference clock)
■ Generated clocks
SM8707E
SM8707F
Video system output
Audio system output
Signal processor
system output
27.0000MHz
512fs
27.0000MHz
768fs
16.9344MHz
33.8688MHz
33.8688MHz
■ Low jitter output (1-sigma output load capacitance typical values)
SM8707E
SM8707F
Video system output
Audio and Signal
processor
20ps
20ps
55ps
40ps
system output
APPLICATIONS
■ DVD players/recorders
PACKAGE DIMENSIONS
(Unit : mm)
■ DVD car navigation system
Weight: 0.07g
ORDERING INFOMATION
Device
Package
SM8707EV
SM8707FV
16pin VSOP
SEIKO NPC CORPORATION - 1
SM8707E/F
PINOUT
(Top view)
VDD1
VSS1
1
16
NC
SO2
MO1
FSEL
SO1
MO2(E ver.)
NC(F ver.)
VDD3
VSS3
AO2
AO1
VDD2
VSS2
XTI
XTO
8
9
PIN DESCRIPTION
No.
Name
VDD1
VSS1
MO1
I/O
-
Description
1
Supply for digital block
Ground for digital block
Video system output
Video system output
2
-
3
O
MO2(E ver.)
NC(F ver.)
VDD2
VSS2
XTI
O
-
4
Non connection output (leave pin open circuit)
Supply for analog block
5
6
-
-
Ground for analog block
7
I
Crystal oscillator connection or external clock input
Crystal oscillator connection
8
XTO
O
O
O
-
9
AO1
Audio system output
10
11
12
13
14
15
16
AO2
Audio system output
VSS3
VDD3
SO1
Ground for digital block
-
Supply for digital block
O
I
Signal processor system output
Sampling frequency select
FSEL
SO2
O
-
Signal processor system output
Non connection (leave pin open circuit or connect to VDD)
NC
SEIKO NPC CORPORATION - 2
SM8707E/F
BLOCK DIAGRAM
FSEL
AO1
AO2
SO1
SO2
MO1
Reference
Divider 0
Phase
Detector 0
Charge
Pump 0
LPF 0
VCO 0
XTI
X′tal
OSC
XTO
Loop
Divider 0
Control
Logic
Reference
Divider 1
Phase
Detector 1
Charge
Pump 1
LPF 1
VCO 1
Loop
Divider 1
MO2(E ver.)
NC (F ver.)
SEIKO NPC CORPORATION - 3
SM8707E/F
Note: Unless otherwise noted, VDD applies to VDD1, VDD2, and VDD3. Similarly, VSS applies to VSS1, VSS2, and
VSS3.
SPECIFICATIONS
Absolute Maximum Ratings
Parameter
Symbol
Rating
Unit
Supply voltage range
VDD1, VDD2, VDD3
-0.3 to +6.5
V
V
DD1-VDD2, VDD1-VDD3,
Supply voltage deviation
± 0.1
V
VDD2-VDD3
VIN
Input voltage range
Output voltage range
Power dissipation
-0.3 to VDD+0.3
-0.3 to VDD+0.3
165
V
V
VOUT
PD
mW
C
Storage temperature range
TSTG
-55 to +125
Recommended Operating Conditions
VSS=VSS1=VSS2=VSS3=0V unless otherwise noted.
SM8707E
Rating
Parameter
Symbol
Condition
Unit
MIN
TYP
MAX
+3.6
40
Supply voltage ranges
VDD1,VDD2,VDD3 （Note 1,2,3）
+3.0
-
V
pF
Output load capacitance 1
Output load capacitance 2
Output load capacitance 3
Master clock frequency
Operating temperature range
CL1
CL2
MO1 output
-
-
-
MO2 output
-
25
pF
CL3
SO1,SO2,AO1,AO2 outputs
When using crystal oscillator
-
-
15
pF
fXTAL
TOPR
-
27.0000
-
-
MHz
℃
-10
+75
SM8707F
Rating
Parameter
Symbol
Condition
Unit
MIN
TYP
MAX
+3.6
25
Supply voltage ranges
VDD1,VDD2,VDD3 （Note 1,2,3）
+3.0
-
V
pF
Output load capacitance 1
Output load capacitance 2
Master clock frequency
Operating temperature range
CL1
CL2
MO1,SO1,SO2 outputs
-
-
-
AO1,AO2 outputs
-
15
pF
fXTAL
TOPR
When using crystal oscillator
-
27.0000
-
-
MHz
℃
-40
+85
Note 1. The supply voltage is defined relative to VSS=0V.
Note 2. The supply voltages applied on VDD1, VDD2 and VDD3 should be derived from a common supply source.
Note 3. If the supply voltages on VDD1, VDD2 and VDD3 are from different sources, they should be applied simultaneously. The
SM8707 may be damaged if the supply voltage timing is different.
SEIKO NPC CORPORATION - 4
SM8707E/F
DC Electrical Characteristics
■ SM8707E
fXTAL=27.0000MHz, VDD=3.3V ± 0.3V, VSS=0V, Ta=-10 to +75C unless otherwise noted.
■ SM8707F
fXTAL=27.0000MHz, VDD=3.3V ± 0.3V, VSS=0V, Ta=-40 to +85C unless otherwise noted.
Rating
TYP
Parameter
Symbol
Pins
Condition
Unit
MIN
MAX
V
DD=3.3V,Ta=25℃,fs=48kHz,
Current
IDD
VDD
Crystal oscillator connected,
no load on all outputs
-
35
45
mA
V
consumption
VIH
VIL
IIH1
IIL1
0.8VDD
-
-
-
-
-
-
-
-
-
Input voltage
Input current
Output voltage
FSEL,XTI
FSEL*1
XTI
VDD=3.3V
-
0.2VDD
VIN=VDD
VIN=0V
-
1
-
-100
A
IIH2
IIL2
VIN=VDD
VIN=0V
-
-40
40
-
VOH
VOL
All outputs
IOH=-2mA
IOL=2mA
VDD-0.4
-
-
V
excluding XTO
0.4
*1. FSEL pin has Schmitt-trigger input and built-in pull-up resistor.
SEIKO NPC CORPORATION - 5
SM8707E/F
AC Electrical Characteristics
SM8707E
fXTAL=27.0000MHz, VDD=3.3V±0.3V, VSS=0V, Ta=-10 to +75C unless otherwise noted.
Rating
TYP
Parameter
Symbol
Pins
Condition
Unit
MIN
MAX
External input clock
frequency*1
Applies to external clock input
use only
fXTI
XTI
MO1
MO2
-
27.0000
2.0
-
MHz
CL=40pF, transition between
VOL=0.2VDD and VOH=0.8VDD
CL=25pF, transition between
VOL=0.2VDD and VOH=0.8VDD
CL=15pF, transition between
-
-
-
-
-
-
-
-
-
-
-
-
Output clock
rise time*2
tr
ns
2.0
SO1,SO2,
AO1,AO2
2.0
V
OL=0.2VDD and VOH=0.8VDD
CL=40pF, transition between
VOH=0.8VDD and VOL=0.2VDD
CL=25pF, transition between
VOH=0.8VDD and VOL=0.2VDD
CL=15pF, transition between
MO1
MO2
2.0
Output clock
fall time*2
tf
ns
2.0
SO1,SO2,
AO1,AO2
MO1
2.0
V
OH=0.8VDD and VOL=0.2VDD
Ta=25℃,CL=40pF,VO=0.5VDD
Ta=25℃,CL=25pF,VO=0.5VDD
-
-
20
20
-
-
tjitter
MO2
Output clock jitter*3
ps
%
(1-sigma)
SO1,SO2,
AO1,AO2
MO1
Ta=25℃,CL=15pF,VO=0.5VDD
-
55
-
Ta=25℃,CL=40pF,VO=0.5VDD
Ta=25℃,CL=25pF,VO=0.5VDD
45
45
50
50
55
55
Output clock
duty cycle*2
MO2
Dt
SO1,SO2,
AO1,AO2
AO1,AO2
All outputs
excluding XTO
Ta=25℃,CL=15pF,VO=0.5VDD
45
-
50
-
55
1
Settling time*2
ts
s
Power-up time*2*4
tp
-
1
5
ms
*1. When using an external clock input, the XTI duty should be 50% with 3.3V clock signal amplitude level. The input signal
voltage should not exceed the absolute maximum rating, otherwise damage may occur.
*2. The numeric values are measured values obtained using the circuit in Figure 1 and the NPC standard evaluation board.
*3. The numeric values are measured values obtained using the circuit in Figure 2 and the NPC standard evaluation board.
*4. This is the time, after the supply is turned ON from the OFF state, until the output clock reaches ±0.1% of the specified
frequency.
SEIKO NPC CORPORATION - 6
SM8707E/F
SM8707F
fXTAL=27.0000MHz, VDD=3.3V±0.3V, VSS=0V, Ta=-40 to +85C unless otherwise noted.
Rating
TYP
Parameter
Symbol
Pins
Condition
Unit
MIN
MAX
External input clock
frequency*1
Applies to external clock input
use only
fXTI
XTI
-
27.0000
2.0
-
MHz
MO1,SO1,
SO2
CL=25pF, transition between
VOL=0.2VDD and VOH=0.8VDD
CL=15pF, transition between
-
-
-
-
-
-
-
-
Output clock
rise time*2
tr
ns
ns
AO1,AO2
2.0
V
OL=0.2VDD and VOH=0.8VDD
MO1,SO1,
SO2
CL=25pF, transition between
VOH=0.8VDD and VOL=0.2VDD
CL=15pF, transition between
VOH=0.8VDD and VOL=0.2VDD
2.0
Output clock
fall time*2
tf
AO1,AO2
2.0
MO1
SO1,SO2
-
-
-
20
40
40
-
-
-
Ta=25℃,CL=25pF,VO=0.5VDD
Ta=25℃,CL=15pF,VO=0.5VDD
Ta=25℃,CL=25pF,VO=0.5VDD
Ta=25℃,CL=15pF,VO=0.5VDD
tjitter
Output clock jitter*3
ps
%
(1-sigma)
AO1,AO2
MO1,SO1,
SO2
Output clock
duty cycle*2
45
45
-
50
50
-
55
55
1
Dt
AO1,AO2
All outputs
excluding XTO
All outputs
excluding XTO
Settling time*2
ts
s
Power-up time*2*4
tp
-
1
5
ms
*1. When using an external clock input, the XTI duty should be 50% with 3.3V clock signal amplitude level. The input signal
voltage should not exceed the absolute maximum rating, otherwise damage may occur.
*2. The numeric values are measured values obtained using the circuit in Figure 1 and the NPC standard evaluation board.
*3. The numeric values are measured values obtained using the circuit in Figure 2 and the NPC standard evaluation board.
*4. This is the time, after the supply is turned ON from the OFF state, until the output clock reaches ±0.1% of the specified
frequency.
27MHz
27MHz
Oscilloscope
Active Probe
DUT
(Infinium
(HP1152A)
HP54845A)
Jitter
Oscilloscope
(HP54720D
+ HP54721A)
Active Probe
(HP54701A)
Measurement
System
DUT
DUT:Device under test
(ASA,M1)
Frequency &
Time Interval
Analyzer
Passive
Probe
(HP10435A)
DUT:Device under test
(HP5371A)
Figure 1. Measurement circuit 1
Figure 2. Measurement circuit 2
SEIKO NPC CORPORATION - 7
SM8707E/F
FUNCTIONAL DESCRIPTION
27MHz Master Clock
The SM8707E/F 27MHz master clock circuit is configured, as shown in Figure 3 with the crystal oscillator element
connected between XTI(Pin 7) and XTO(Pin 8).
Alternatively, the 27MHz master clock can be supplied from an external master clock input on XTI, as shown in
Figure 4.
If an external input clock on XTI is used, it is recommended that the frequency be 27.0000MHz, with 50% duty, and
3.3V voltage amplitude level.
Furthermore, when using an external clock input, the input signal voltage should not exceed the absolute maximum
rating, otherwise damage may occur.
C1
XTI(Pin 7)
Internal
Oscillator
Circuits
XTO(Pin 8)
C2
C1,C2=5 to 33pF
MO
Figure 3. Crystal oscillator connection
External Clock
Open
XTI(Pin 7)
XTO(Pin 8)
Internal
Circuits
Oscillator
MO
Figure 4. External clock input
SEIKO NPC CORPORATION - 8
SM8707E/F
Sampling Frequency and Output Clock Frequency
SM8707E
The SM8707E sampling frequency fs can be switched between 44.1kHz when FSEL(Pin 14) is LOW, and 48kHz
when FSEL is HIGH. The audio outputs(AO1 and AO2) are equivalent to 512fs, where fs is determined by the setting
on FSEL. In addition, the signal processor outputs(SO1 and SO2) are 33.8688MHz clocks derived from the master
clock. And the video outputs(MO1 and MO2) are 27MHz clocks, identical to the master clock.
The SM8707E supported clock frequencies are shown in Table 1.
Sampling
frequency fs
[kHz]
Output clock frequency [MHz]
FSEL
AO1
AO2
SO1
SO2
MO1
MO2
(Pin 14)
(Pin 9)
24.5760
(512fs)
22.5792
(512fs)
(Pin 10)
24.5760
(512fs)
22.5792
(512fs)
(Pin 13)
(Pin15)
(Pin 3)
(Pin 4)
HIGH
LOW
48
33.8688
33.8688
33.8688
33.8688
27.0000
27.0000
27.0000
27.0000
44.1
Table 1. Sampling frequency and output clock frequency (27.0000MHz master clock frequency)
SM8707F
The SM8707F sampling frequency fs can be switched between 44.1kHz when FSEL(Pin 14) is HIGH, and 48kHz
when FSEL is LOW. The audio outputs(AO1 and AO2) are equivalent to 768fs, where fs is determined by the setting
on FSEL. In addition, the signal processor outputs(SO1 and SO2) are 16.9344MHz and 33.8688MHz clocks,
respectively, derived from the master clock. The video output (MO1) is a 27MHz clock, identical to the master clock.
The SM8707F supported clock frequencies are shown in Table 2.
Sampling
frequency fs
[kHz]
Output clock frequency [MHz]
FSEL
AO1
AO2
SO1
SO2
MO1
(Pin 14)
(Pin 9)
33.8688
(768fs)
36.8640
(768fs)
(Pin 10)
33.8688
(768fs)
36.8640
(768fs)
(Pin 13)
(Pin15)
(Pin 3)
HIGH
LOW
44.1
48
16.9344
16.9344
33.8688
33.8688
27.0000
27.0000
Table 2. Sampling frequency and output clock frequency (27.0000MHz master clock frequency)
SEIKO NPC CORPORATION - 9
SM8707E/F
Spike Noise Prevention Function
SM8707F/E have a spike noise prevention circuit that prevents any spike noise generation in the audio output clocks
when the sampling frequency is switched using FSEL.
The state of the AOx output before and after FSEL is switched is shown in Figure 5.
When FSEL is switched, either from LOW to HIGH or HIGH to LOW, the spike noise prevention circuit stops the
AOx clock output by a maximum of 1s, and then the output clock changes to reflect the current FSEL setting.
E version : fs=48kHz
F version : fs=44.1kHz
E version : fs=44.1kHz
F version : fs=48kHz
FSEL
AOx
1μs(max)
Figure 5. Spike noise prevention circuit timing at sampling frequency switching
Sampling Frequency Switching Settling Time
The clock output response when the sampling frequency is switched using FSEL is shown in Figure 6. SM8707E/F
have a spike noise prevention circuit which stops the output AOx clocks for a fixed interval, which means the settling
time is a maximum 1s when the sampling frequency is switched.
0.8VDD
FSEL
0.2VDD
ts
ts
E version : fs=44.1kHz
F version : fs=48kHz
E version : fs=48kHz
F version : fs=44.1kHz
E version : fs=44.1kHz
F version : fs=48kHz
AOx
MOx
SOx
27.0000MHz
33.8688MHz (E version)
16.9344/33.8688MHz (F version)
Figure 6. Output signal switching timing
SEIKO NPC CORPORATION - 10
SM8707E/F
SM8707E/F OUTPUT FREQUENCY LISTING
FSEL
polarity
(Pin 14)
Sampling
frequency fs
[kHz]
Output clock frequency [MHz]
Pin 4 Pin 9 Pin 10 Pin 13
Version
Pin 3
Pin 15
24.5760 24.5760
(512fs) (512fs)
22.5792 22.5792
H
L
48.0
44.1
27.0000 27.0000
33.8688 33.8688
33.8688 33.8688
SM8707E
27.0000 27.0000
(512fs)
15
(512fs)
15
Output load capacitance [pF]
Pin name
40
25
15
15
MO1
MO2
AO1
AO2
SO1
SO2
33.8688 33.8688
(768fs) (768fs)
36.8640 36.8640
H
L
44.1
48.0
27.0000
27.0000
16.9344 33.8688
16.9344 33.8688
-
SM8707F
(768fs)
15
(768fs)
15
Output load capacitance [pF]
Pin name
25
-
25
25
MO1
NC
AO1
AO2
SO1
SO2
SEIKO NPC CORPORATION - 11
SM8707E/F
Please pay your attention to the following points at time of using the products shown in this document.
1. The products shown in this document (hereinafter ”Products”) are designed and manufactured to the generally accepted standards of
reliability as expected for use in general electronic and electrical equipment, such as personal equipment, machine tools and
measurement equipment. The Products are not designed and manufactured to be used in any other special equipment requiring
extremely high level of reliability and safety, such as aerospace equipment, nuclear power control equipment, medical equipment,
transportation equipment, disaster prevention equipment, security equipment. The Products are not designed and manufactured to be
used for the apparatus that exerts harmful influence on the human lives due to the defects, failure or malfunction of the Products.
If you wish to use the Products in that apparatus, please contact our sales section in advance.
In the event that the Products are used in such apparatus without our prior approval, we assume no responsibility whatsoever for any
damages resulting from the use of that apparatus.
2. NPC reserves the right to change the specifications of the Products in order to improve the characteristics or reliability thereof.
3. The information described in this document is presented only as a guide for using the Products. No responsibility is assumed by us for any
infringements of patents or other rights of the third parties which may result from its use. No license is granted by implication or otherwise
under any patents or other rights of the third parties. Then, we assume no responsibility whatsoever for any damages resulting from that
infringements.
4. The constant of each circuit shown in this document is described as an example, and it is not guaranteed about its value of the mass
production products.
5. In the case of that the Products in this document falls under the foreign exchange and foreign trade control law or other applicable laws and
regulations, approval of the export to be based on those laws and regulations are necessary. Customers are requested appropriately take
steps to obtain required permissions or approvals from appropriate government agencies.
SEIKO NPC CORPORATION
1-9-9, Hatchobori, Chuo-ku,
Tokyo 104-0032, Japan
Telephone: +81-3-5541-6501
Facsimile: +81-3-5541-6510
http://www.npc.co.jp/
Email:sales@npc.co.jp
ND12003-E-00 2012.1
SEIKO NPC CORPORATION - 12
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