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參數(shù)資料
| 型號： | TDA8757CHV/17 |
| 廠商： | NXP SEMICONDUCTORS |
| 元件分類： | ADC |
| 英文描述： | 3-CH 8-BIT PROPRIETARY METHOD ADC, PARALLEL ACCESS, PQFP144 |
| 封裝： | 20 X 20 MM, 1.40 MM HEIGHT, PLASTIC, SOT-612-1, HLQFP-144 |
| 文件頁數(shù)： | 7/38頁 |
| 文件大?。?/td> | 894K |
| 代理商： | TDA8757CHV/17 |
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Philips Semiconductors
TDA8757C
Triple 8-bit ADC 205 Msps
Preliminary data
Rev. 01 — 14 August 2002
15 of 38
9397 750 10111
Koninklijke Philips Electronics N.V. 2002. All rights reserved.
8.2.5
PLL
The ADCs are clocked by either the internal PLL locked to the reference clock
CKREF or an external clock connected to pin CKEXT. All parts of the PLL are on-chip
except the loop lter capacitors. The selection is performed via the serial interface by
setting bit ‘Ckext’ in register PHASE (Ckext = 1 when the external clock is used).
The reference clock (CKREF) range is between 15 and 150 kHz. Consequently, the
VCO minimum frequency is 12 MHz and the maximum frequency is 205 MHz. The
gain of the VCO part can be controlled through the serial interface, depending on the
frequency range to which the PLL is locked.
Moreover, the PLL may be locked either on the rising or on the falling edge of the
CKREF signal pulses. This choice is made via the serial interface by setting bit ‘Edge’
in register CONTROL (rising edge when bit ‘Edge’ = 0).
The charge pump current (Icp) can increase the PLL bandwidth. It is programmable
through the serial interface by setting bits ‘Ip2’, ‘Ip1’ and ‘Ip0’ in the control register
(see Table 8).
Different resistance values (R) for the lter can also be programmed through the
serial interface by setting the bits ‘Z2’, ‘Z1’ and ‘Z0’ in register VCO (see Table 9).
To have optimal PLL performance, R and Icp must be chosen so that:
The result of the product ‘R
× Icp’ is smaller than a determined limit (Lim)
The result of the product ‘R
× Icp’ is as close as possible to this limit (Lim).
(1)
Fig 7.
Denition of odd and even pixels; Edge = 0, Dmx = 0 and Ckrp = 1.
FCE708
CKADC
CKREF
CKREFO
OUT A
XXX
ODD
EVEN
XXX
Lim
0.3
π DR
PLL
×
f
ref
×
K
0
--------------------------------------------------
=
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| TDA8759HV/8/C1 | 功能描述:模數(shù)轉換器 - ADC 3X8-BITS VIDEO ADC 110MSPS RoHS:否 制造商:Texas Instruments 通道數(shù)量:2 結構:Sigma-Delta 轉換速率:125 SPs to 8 KSPs 分辨率:24 bit 輸入類型:Differential 信噪比:107 dB 接口類型:SPI 工作電源電壓:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:VQFN-32 |
| TDA8759HV/8/C1,551 | 功能描述:模數(shù)轉換器 - ADC 3X8-BITS VIDEO RoHS:否 制造商:Texas Instruments 通道數(shù)量:2 結構:Sigma-Delta 轉換速率:125 SPs to 8 KSPs 分辨率:24 bit 輸入類型:Differential 信噪比:107 dB 接口類型:SPI 工作電源電壓:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:VQFN-32 |
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