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| 型号： | 5962-9957001QRA |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | ADC |
| 英文描述： | 4-CH 12-BIT SUCCESSIVE APPROXIMATION ADC, SERIAL ACCESS, CDIP20 |
| 封装： | CERDIP-20 |
| 文件页数： | 29/47页 |
| 文件大小： | 764K |
| 代理商： | 5962-9957001QRA |
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TLV2544, TLV2548
2.7 V TO 5.5 V, 12-BIT, 200 KSPS, 4/8 CHANNEL, LOW POWER,
SERIAL ANALOG-TO-DIGITAL CONVERTERS WITH AUTO POWER DOWN
SLAS198A –FEBRUARY 1999– REVISED AUGUST 1999
35
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
PRINCIPLES OF OPERATION
Rs
ri
VS
VC
Driving Source
TLV2544/48
Ci
VI
VI = Input Voltage at AIN
VS = External Driving Source Voltage
Rs = Source Resistance
ri = Input Resistance (MUX on Resistance)
Ci = Input Capacitance
VC= Capacitance Charging Voltage
Driving source requirements:
Noise and distortion for the source must be equivalent to the resolution of the converter.
Rs must be real at the input frequency.
Figure 39. Equivalent Input Circuit Including the Driving Source
maximum conversion throughput
For a supply voltage of 5 V, if the source impedance is less than 1 k
, and the ADC analog input capacitance
Ci is less than 50 pF, this equates to a minimum sampling time tch(0.5 LSB) of 0.676
s (t1s). Since the
sampling time requires 12 SCLKs, the fastest SCLK frequency is 12/tch = 12 MHz.
The minimal total cycle time is given as:
tc
+ tcommand ) tch ) tconv ) td(EOCH–CSL) + 4
1
f (SCLK)
) 12
1
f (SCLK)
) 3.6 ms ) 0.1 ms
+ 16
1
12
MHz
) 3.7 ms + 5.03 ms
This is equivalent to a maximum throughput of 200 KSPS. The throughput can be even higher with a smaller
source impedance.
When source impedance is 100
, the minimum sampling time becomes:
tch (1 2 LSB)
+ Rt
Ci
In(8192)
+ 0.27 ms
The maximum SCLK frequency possible is 12/tch = 44 MHz. Then a 20 MHz clock (maximum SCLK frequency
for the TLV2544/2548 ) can be used. The minimal total cycle time is then reduced to:
tc
+ tcommand ) tch ) tconv ) td(EOCH–CSL) + 4
1
f (SCLK)
) 12
1
f (SCLK)
) 3.6 ms ) 0.1 ms
+ 0.8 ms ) 3.6 ms ) 0.1 ms + 4.5 ms
The maximum throughput is 1/4.5
s = 222 KSPS for this case.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| 5962-9957601Q2A | 制造商:Texas Instruments 功能描述:5962-9957601Q2A - Rail/Tube |
| 5962-9957601QPA | 功能描述:数模转换器- DAC 12B1 or 3.5 us DAC Serial InpDual DAC RoHS:否 制造商:Texas Instruments 转换器数量:1 DAC 输出端数量:1 转换速率:2 MSPs 分辨率:16 bit 接口类型:QSPI, SPI, Serial (3-Wire, Microwire) 稳定时间:1 us 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:SOIC-14 封装:Tube |
| 5962-9957701NXD | 制造商:Texas Instruments 功能描述:THS1206MDAB, ADC, 12BITSERIAL, 6MSPS - Rail/Tube |
| 5962-9958101QXC | 功能描述:LVDS 接口集成电路 RoHS:否 制造商:Texas Instruments 激励器数量:4 接收机数量:4 数据速率:155.5 Mbps 工作电源电压:5 V 最大功率耗散:1025 mW 最大工作温度:+ 85 C 封装 / 箱体:SOIC-16 Narrow 封装:Reel |
| 5962-9958301Q2A | 制造商:Texas Instruments 功能描述:DC DC Cntrlr Single-OUT PWM DC to DC Controller 3.6V to 40V Input 20-Pin LCCC Tube |
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