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參數資料
| 型號： | TLV987CPFB |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 模擬信號調理 |
| 英文描述： | SPECIALTY ANALOG CIRCUIT, PQFP48 |
| 封裝： | PLASTIC, TQFP-48 |
| 文件頁數： | 6/21頁 |
| 文件大小： | 285K |
| 代理商： | TLV987CPFB |
TLV987
3-V 10-BIT 27 MSPS AREA CCD SENSOR
SIGNAL PROCESSOR
SLAS211A – MARCH 1999 – REVISED SEPTEMBER 1999
14
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
PRINCIPLES OF OPERATION
internal timing
The SR and SV signals are required to operate the CDS as previously explained. The user needs to synchronize
the SR and SV clocks with the CCD signal waveform. The output of the ADC is read out to external circuitry by
the ADCCLK signal that is also used internally to control both ADC and PGA operations. It is required that the
positive half cycle of the ADCCLK signal always falls in between two adjacent SV pulses as shown in Figure 2.
The user can then fine tune the ADCCLK timing in relation to the CDS timing to achieve optimal performance.
The TLV987 has direct access to the CDS and PGA internal clocks through the TPP pin and the TPM pin, which
may be used to assist timing alignment. See
test register description paragraph for details.
The CLAMP signal is used to activate the input clamping, and the OBCLP signal is used to activate auto optical
black and offset correction.
input blanking function
During some periods of operation, large input transients may occur at the TLV987 input, which can saturate the
input circuits and cause long recovery time. To prevent circuit saturation under such a situation, the TLV987
includes an input blanking function that blocks the input signals by disabling CDS operation whenever the BLKG
input is pulled low.
3-wire serial interface
A simple 3-wire (SCLK, SDIN, and CS) serial interface is provided to allow writing to the internal registers of
the TLV987. The serial clock SCLK can be run at a maximum speed of 40 MHz. The serial data SDIN is 16 bits
long. After two leading null bits, there are four address bits for which internal register is to be updated, the
following ten bits are the data to be written to the register. To enable the serial port, the CS pin must be held
low. The data transfer is initiated by the incoming SCLK after CS falls.
device reset
When the reset pin (pin 29) is pulled low, all internal registers are set to their default values. The device also
resets itself when it is first powered on. In addition, the TLV987 has a software-reset function that resets the
device when writing a control bit to the control register.
See
test register description paragraph for the register default values.
voltage references
An internal precision voltage reference of 1.5 V nominal is provided. This reference voltage is used to generate
the ADC Ref– voltage of 1 V and Ref+ voltage of 2 V. All internally-generated voltages are fixed values and
cannot be adjusted.
power-down mode (standby)
The TLV987 implements both hardware and software power-down modes. Pulling the STBY pin (pin 30) low
puts the device in the low-power stand-by mode. Total supply current drops to about 0.6 mA. Setting a
power-down control bit in the control register can also activate the power-down mode. The user can still program
all internal registers during the power-down mode.
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相關代理商/技術參數 |
參數描述 |
|---|---|
| TLV987PFB | 制造商:TI 制造商全稱:Texas Instruments 功能描述:3-V 10-BIT 27 MSPS AREA CCD SENSOR SIGNAL PROCESSOR |
| TLV990 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:3-V, 10-BIT, 28-MSPS AREA CCD AND VIDEO SIGNAL PROCESSOR |
| TLV990-13 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:3-V, 10-BIT, 13-MSPS AREA CCD ANALOG FRONT END |
| TLV990-13PFB | 功能描述:視頻模擬/數字化轉換器集成電路 CCD Sig Processor/ Digitizer Designed RoHS:否 制造商:Texas Instruments 輸入信號類型:Differential 轉換器數量:1 ADC 輸入端數量:4 轉換速率:3 Gbps 分辨率:8 bit 結構: 輸入電壓:3.3 V 接口類型:SPI 信噪比: 電壓參考: 電源電壓-最大:3.45 V 電源電壓-最小:3.15 V 最大功率耗散: 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝 / 箱體:TCSP-48 封裝:Reel |
| TLV990-13PFBG4 | 功能描述:視頻模擬/數字化轉換器集成電路 CCD Sig Processor/ Digitizer Designed RoHS:否 制造商:Texas Instruments 輸入信號類型:Differential 轉換器數量:1 ADC 輸入端數量:4 轉換速率:3 Gbps 分辨率:8 bit 結構: 輸入電壓:3.3 V 接口類型:SPI 信噪比: 電壓參考: 電源電壓-最大:3.45 V 電源電壓-最小:3.15 V 最大功率耗散: 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝 / 箱體:TCSP-48 封裝:Reel |
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