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| 型号： | TDA8757AHL/21 |
| 厂商： | NXP SEMICONDUCTORS |
| 元件分类： | ADC |
| 英文描述： | 3-CH 8-BIT PROPRIETARY METHOD ADC, PARALLEL ACCESS, PQFP144 |
| 封装： | PLASTIC, HLQFP-144 |
| 文件页数： | 13/37页 |
| 文件大小： | 908K |
| 代理商： | TDA8757AHL/21 |
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Philips Semiconductors
TDA8757A
Triple 8-bit ADC 205 Msps
Preliminary data
Rev. 01 — 22 March 2002
20 of 37
9397 750 09549
Koninklijke Philips Electronics N.V. 2002. All rights reserved.
9.1.5
VCO register
Bits ‘Z2’, ‘Z1’ and ‘Z0’ enable the internal resistance for the VCO lter to be selected.
Bits ‘Vco1’ and ‘Vco0’ control the VCO gain.
The default programmed value is as follows:
Internal resistance = 2.25 k
VCO gain = 70 MHz/V.
9.1.6
Divider register
This register controls the PLL frequency. Bits ‘Di8’ to ‘Di0’ are the LSB bits. The
default programmed value is 0110 1001 1000 = 1688.
The MSB bits (‘Di11’, ‘Di10’ and ‘Di9’) and the LSB bit ‘Di0’ have to be programmed
before bits ‘Di8’ to ‘Di1’ in order to have the required divider ratio. Bit ‘Di0’ is used for
the parity divider number (Di0 = 0: even number; Di0 = 1: odd number). It should be
noted that if the I2C-bus programming is done in mode 1 and the bit ‘Di0’ has to be
toggled, then the registers have to be loaded twice to have the update divider ratio.
9.1.7
Phase register
Bit ‘Ckext’ is logic 0 when the used clock is the PLL clock and logic 1 when the used
clock is the external clock.
Bit ‘Ckrs’ is logic 1 when the synchronization is done with CKREF (see Figure 3).
Bits ‘P4’ to ‘P0’ are used to program the phase shift for clock CKDATA.
Table 9:
VCO register bits
Z2
Z1
Z0
Resistance (k
)
0
high-impedance
0019
0106.4
0114.5
1003.2
1
0
1
2.25
1101.6
1111.1
Table 10: VCO gain control
Vco1
Vco0
VCO gain (MHz/V)
Pixel clock
frequency range
(MHz)
0
20
12 to 28
0
1
30
28 to 55
1
0
60
55 to 115
1
115
115 to 205
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相关代理商/技术参数 |
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| TDA8757HL | 制造商:PHILIPS 制造商全称:NXP Semiconductors 功能描述:Triple 8-bit ADC 170 Msps |
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| TDA8759HV/8/C1 | 功能描述:模数转换器 - ADC 3X8-BITS VIDEO ADC 110MSPS RoHS:否 制造商:Texas Instruments 通道数量:2 结构:Sigma-Delta 转换速率:125 SPs to 8 KSPs 分辨率:24 bit 输入类型:Differential 信噪比:107 dB 接口类型:SPI 工作电源电压:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-32 |
| TDA8759HV/8/C1,551 | 功能描述:模数转换器 - ADC 3X8-BITS VIDEO RoHS:否 制造商:Texas Instruments 通道数量:2 结构:Sigma-Delta 转换速率:125 SPs to 8 KSPs 分辨率:24 bit 输入类型:Differential 信噪比:107 dB 接口类型:SPI 工作电源电压:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-32 |
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