View SM8706A_412310.PDF datasheet online --- IC-ON-LINE

Datasheet File OCR Text:

SM8706A
NIPPON PRECISION CIRCUITS INC.
Clock Generator for DVD Players
OVERVIEW
The SM8706A is a clock generator IC that generates 3 clocks with 6 outputs from a 36.8640MHz master clock for application in DVD players. The SM8706A has 2 built-in PLL circuits that together with a crystal oscillator can generate the 384fs and 768fs audio system clocks, 27MHz and 54MHz video system clocks, and 16.9344MHz and 33.8688MHz signal processor system clocks required for a DVD player. The SM8706A also supports the 44.1kHz and 48kHz sampling frequencies, and the sampling frequency can be switched while the device is operating.
FEATURES
I
PINOUT
(Top view)
I
I I I I
36.8640MHz master clock (internal PLL reference clock) Generated clocks * Video system output: 27MHz, 54MHz * Audio system output: 384fs, 768fs * Signal processor system output: 16.9344MHz, 33.8688MHz Supported sampling frequency fs: 44.1/48kHz Low jitter output: 40ps (typ, 1-sigma, 25pF load) Supply voltage: 3.3V 0.3V 16-pin VSOP package
VDD1 VSS1 MO1 MO2 VDD2 VSS2 XTI XTO
1
16
CE SO2 FSEL SO1 VDD3 VSS3 AO2
8706AV
APPLICATIONS
I I
8
9
AO1
DVD players DVD car navigation system
ORDERING INFORMATION
Device SM8706AV Package 16-pin VSOP
PACKAGE DIMENSIONS
(Unit: mm) Weight: 0.07g
4.4 0.2 6.4 0.2
0.10 0.05
5.1 0.2
1.15 0.1
0.275typ
0.0 0.15 -
+ 0.1 5
0 to 10
0.65
0.10 0.22 - 0.05
+ 0.1
0.12 M
0.5 0.2
NIPPON PRECISION CIRCUITS--1
SM8706A
BLOCK DIAGRAM
FSEL
XTI XTO
Reference Divider 0 X'tal OSC
Phase Detector 0
Charge Pump 0
LPF 0
VCO 0
AO1
AO2 Loop Divider 0 (PLL 0) Control Logic SO1
Reference Divider 1
Phase Detector 1
Charge Pump 1
LPF 1
VCO 1
SO2
Loop Divider 1 (PLL 1)
MO1
MO2 CE
PIN DESCRIPTION
Number 1 2 3 4 5 6 7 8 9 10 11 12 13 Name VDD1 VSS1 MO1 MO2 VDD2 VSS2 XTI XTO AO1 AO2 VSS3 VDD3 SO1 I/O - - O O - - I O O O - - O Supply 1 for digital block Ground 1 for digital block Video system output 1 (27MHz fixed) Video system output 2 (54MHz fixed) Supply 2 for analog block Ground 2 for analog block Crystal oscillator connection or external clock input Crystal oscillator connection Audio system output 1 (384fs output) Audio system output 2 (768fs output) Ground 3 for digital block Supply 3 for digital block Signal processor system output 1 (16.9344MHz fixed) Sampling frequency select FSEL = HIGH: fs = 48kHz FSEL = LOW: fs = 44.1kHz (with internal pull-up resistor, Schmitt-trigger input) Signal processor system output 2 (33.8688MHz fixed) Chip enable (HIGH = Enable, LOW = Disable) Description
14
FSEL
I
15 16
SO2 CE
O I
NIPPON PRECISION CIRCUITS--2
SM8706A Note: Unless otherwise noted, VDD applies to VDD1, VDD2, and VDD3. Similarly, VSS applies to VSS1, VSS2, and VSS3.
SPECIFICATIONS
Absolute Maximum Ratings
Parameter Supply voltage range Supply voltage deviation Input voltage range Output voltage range Power dissipation Storage temperature range Symbol VDD1 , VDD2 , VDD3 VDD1 - VDD2 , VDD1 - VDD3 , VDD2 - VDD3 VIN VOUT PD Tstg Condition Rating - 0.3 to 6.5 0.1 - 0.3 to VDD + 0.3 - 0.3 to VDD + 0.3 165 - 55 to 125 Unit V V V V mW C
Recommended Operating Conditions
VSS = VSS1 = VSS2 = VSS3 = 0V unless otherwise noted.
Rating Parameter Supply voltage ranges1, 2, 3 Output load capacitance 1 Output load capacitance 2 Master clock frequency Operating temperature range Symbol VDD1 , VDD2 , VDD3 CL1 CL2 fXTAL Topr MO1, SO1, SO2 outputs All outputs excluding MO1, SO1, SO2, XTO When using crystal oscillator Condition min + 3.0 - - - - 40 typ - - - 36.8640 - max + 3.6 25 15 - + 85 V pF pF MHz C Unit
1. The supply voltage is defined relative to VSS = 0V 2. The supply voltages applied on VDD1, VDD2, and VDD3 should be derived from a common supply source. 3. If the supply voltages on VDD1, VDD2, and VDD3 are from different sources, they should be applied simultaneously. The SM8706A may be damaged if the supply voltage timing is different.
DC Electrical Characteristics
fXTAL = 36.8640MHz, VDD = 3.0V 0.3V, VSS = 0V, Ta = - 40 to 85 C unless otherwise noted.
Rating Parameter Symbol Condition min Current consumption HIGH-level input voltage LOW-level input voltage HIGH-level input current1 LOW-level input current1 HIGH-level input current LOW-level input current HIGH-level output voltage LOW-level output voltage IDD VIH VIL IIH1 IIL1 IIH2 IIL2 VOH VOL VDD = 3.3V, Ta = 25C, fs = 48kHz, Crystal oscillator, no load on all outputs FSEL, CE, XTI, VDD = 3.3V FSEL, CE, VIN = VDD FSEL, CE, VIN = 0V XTI, VIN = VDD XTI, VIN = 0V All outputs excluding XTO, IOH = - 2mA All outputs excluding XTO, IOL = 2mA - 0.8 VDD - - - 100 - - 40 VDD - 0.4 - typ 35 - - - - - - - - max 45 - 0.2 VDD 1 - 40 - - 0.4 mA V V A A A A V V Unit
1. FSEL and CE pins have Schmitt-trigger input and built-in pull-up resistor. NIPPON PRECISION CIRCUITS--3
SM8706A
AC Electrical Characteristics
fXTAL = 36.8640MHz, VDD = 3.0V 0.3V, VSS = 0V, Ta = - 40 to 85 C unless otherwise noted.
Rating Parameter External input clock frequency1 Symbol fXTI Condition min XTI, applies to external clock input use only MO1, SO1, SO2, CL = 25 pF, transition between VOL = 0.2VDD and VOH = 0.8VDD Output clock rise time2 tr Outputs excluding MO1, SO1, SO2, and XTO, CL = 15pF, transition between VOL = 0.2VDD and VOH = 0.8VDD MO1, SO1, SO2, CL = 25pF, transition between VOH = 0.8VDD and VOL = 0.2VDD Output clock fall time2 tf Outputs excluding MO1, SO1, SO2, and XTO, CL = 15pF, transition between VOH = 0.8VDD and VOL = 0.2VDD MO1, SO1, SO2, Ta = 25C, CL = 25pF, VO = 0.5VDD Outputs excluding MO1, SO1, SO2, and XTO, Ta = 25C, CL = 15pF, VO = 0.5VDD MO1, SO1, SO2, Ta = 25C, CL = 25pF, VO = 0.5VDD Outputs excluding MO1, SO1, SO2, and XTO, Ta = 25C, CL =15 pF, VO = 0.5VDD Settling time2 Power-up time2,4 tS tP All outputs excluding XTO All outputs excluding XTO - - typ 36.8640 2.0 max - - ns - 2.0 - MHz Unit
-
2.0
- ns
-
2.0
-
- - 45 45 - -
40 40 50 50 - 1
- ps - 55 % 55 1 5 s ms
Output clock jitter3
tjitter (1-sigma)
Output clock duty cycle2
Dt
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.
36.864MHz 36.864MHz
DUT
Active Probe (HP1152A)
Oscilloscope (Infinium HP54845A) DUT Frequency & Time Interval Analyzer (HP5371A) Active Probe (HP54701A)
DUT:Device under testing Passive Probe (HP10435A)
Oscilloscope (HP54720D +HP54721A)
Jitter Measurement System (ASA, M1)
DUT:Device under testing
Figure 1. Measurement circuit 1
Figure 2. Measurement circuit 2
NIPPON PRECISION CIRCUITS--4
SM8706A
FUNCTIONAL DESCRIPTION
36.8640MHz Master Clock
The SM8706A 36.8640MHz 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 36.8640MHz 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 36.8640MHz, 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) Oscillator Internal Circuits Control Logic MO1 (Pin 3) MO2 (Pin 4)
C2 C1, C2 = 5 to 33pF
XTO (Pin 8)
Figure 3. Crystal oscillator connection
External Clock
XTI (Pin 7) Oscillator Internal Circuits Control Logic MO1 (Pin 3) MO2 (Pin 4)
Open
XTO (Pin 8)
Figure 4. External clock input
NIPPON PRECISION CIRCUITS--5
SM8706A
Sampling Frequency and Output Clock Frequency
The SM8706A 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 a 384fs and 768fs frequency clock, respectively, where fs is determined by the setting on FSEL. In addition, the signal processor outputs (SO1 and SO2) are a 16.9344MHz and 33.8688MHz frequency clock, respectively, derived from the master clock. The video outputs (MO1 and MO2) are a 27MHz and 54MHz frequency clock, respectively, derived from the master clock. When CE (Pin16) is HIGH, the chip is enabled. When LOW, the chip is disabled. When disabled, all output go LOW and all internal circuits stop operating. When CE goes LOW to HIGH, the chip moves from disabled to enabled, the time taken until the output frequency clocks stabilize is a maximum of 5ms. The SM8706A output clock frequencies that can be selected is shown in Table 1. The output clock response timing relative to the CE setting is shown in Figure 5.
Table 1. Sampling frequency and output clock frequency (36.8640MHz master clock frequency)
FSEL (Pin 14) LOW HIGH LOW HIGH Sampling frequency fs [kHz] 44.1 H 48 44.1 L 48 L L L L L L 18.4320 36.8640 16.9344 33.8688 27.0000 54.0000 Output clock frequency [MHz] CE (Pin 16) AO1 (Pin 9) 16.9344 AO2 (Pin 10) 33.8688 SO1 (Pin 13) 16.9344 SO2 (Pin 15) 33.8688 MO1 (Pin 3) 27.0000 MO2 (Pin 4) 54.0000
CE
5ms (max)
AO1/AO2
SO1/SO2
MO1/MO2
Figure 5. CE switching response
NIPPON PRECISION CIRCUITS--6
SM8706A
Sampling Frequency Switching Settling Time
The clock output response timing when the sampling frequency fs is switched using FSEL is shown in Figure 6. The settling time ts for the audio output clock when switching the sampling frequency is 1s maximum.
0.8VDD
FSEL
0.2VDD
tS
AO1 AO2
fs = 44.1kHz fs = 48kHz
tS
fs = 44.1kHz
MO1 MO2
27.0000MHz /54MHz
SO1 SO2
16.9344MHz /33.8688MHz
Figure 6. Output signal switching timing
NIPPON PRECISION CIRCUITS--7
SM8706A
NIPPON PRECISION CIRCUITS INC. reserves the right to make changes to the products described in this data sheet in order to improve the design or performance and to supply the best possible products. Nippon Precision Circuits Inc. assumes no responsibility for the use of any circuits shown in this data sheet, conveys no license under any patent or other rights, and makes no claim that the circuits are free from patent infringement. Applications for any devices shown in this data sheet are for illustration only and Nippon Precision Circuits Inc. makes no claim or warranty that such applications will be suitable for the use specified without further testing or modification. The products described in this data sheet are not intended to use for the apparatus which influence human lives due to the failure or malfunction of the products. Customers are requested to comply with applicable laws and regulations in effect now and hereinafter, including compliance with export controls on the distribution or dissemination of the products. Customers shall not export, directly or indirectly, any products without first obtaining required licenses and approvals from appropriate government agencies. NIPPON PRECISION CIRCUITS INC. 4-3, Fukuzumi 2-chome Koto-ku, Tokyo 135-8430, Japan Telephone: +81-3-3642-6661 Facsimile: +81-3-3642-6698 http://www.npc.co.jp/ Email: sales@npc.co.jp NC0012AE 2000.12
NIPPON PRECISION CIRCUITS INC.
NIPPON PRECISION CIRCUITS--8

▲Up To Search▲

Price & Availability of SM8706A

	To Download SM8706A Datasheet File
If you can't view the Datasheet, Please click here to try to view without PDF Reader .