參數(shù)資料
型號： ADS7953SBRHBT
廠商： TEXAS INSTRUMENTS INC
元件分類： ADC
英文描述： 16-CH 12-BIT SUCCESSIVE APPROXIMATION ADC, SERIAL ACCESS, PQCC32
封裝： GREEN, PLASTIC, PQFP-32
文件頁數(shù)： 37/63頁
文件大?。?/td> 1734K
代理商： ADS7953SBRHBT
200 ohm
7 pF
3 pF
20M ohm
3 pF
5 pF
80 ohm
Ch0 assumed to be on
Chn assumed to be off
Ch0
Chn
MXO
AINP
W
SLAS605A – JUNE 2008 – REVISED JANUARY 2010
www.ti.com
Figure 59. ADC and Mux Equivalent Circuit
REFERENCE
The ADS79XX can operate with an external 2.5V ± 10mV reference. A clean, low noise, well-decoupled
reference voltage on the REF pin is required to ensure good performance of the converter. A low noise band-gap
reference like the REF5025 can be used to drive this pin. A 10-mF ceramic decoupling capacitor is required
between the REF and GND pins of the converter. The capacitor should be placed as close as possible to the
pins of the device.
POWER SAVING
The ADS79XX devices offer a power-down feature to save power when not in use. There are two ways to
powerdown the device. It can be powered down by writing DI05 = 1 in the Mode Control register (refer to
Table 1, Table 2 and Table 5); in this case the device powers down on the 16th falling edge of SCLK in the next
data frame. Another way to powerdown the device is through GPIO. GPIO3 can act as a PD input (refer to
Table 10, for assigning this functionality to GPIO3). This is an asynchronous and active low input. The device
powers down instantaneously after GPIO3 (PD) = 0. The device will powerup again on the CS falling edge while
DI05 = 0 in the Mode Control register and GPIO3 (PD) = 1.
DIGITAL OUTPUT
As discussed previously in the Device Operation section, the digital output of the ADS79XX devices is SPI
compatible. The following table lists the output codes corresponding to various analog input voltages.
Table 11. Ideal Input Voltages and Output Codes for 12-Bit Devices (ADS7950/51/52/53)
DESCRIPTION
ANALOG VALUE
DIGITAL OUTPUT
Full scale range
Range 1
→ Vref
Range 2
→ 2×Vref
STRAIGHT BINARY
Least significant bit (LSB)
Vref/4096
2Vref/4096
BINARY CODE
HEX CODE
Full scale
Vref – 1 LSB
2Vref – 1 LSB
1111 1111 1111
FFF
Midscale
Vref/2
Vref
1000 0000 0000
800
Midscale – 1 LSB
Vref/2 – 1 LSB
Vref – 1 LSB
0111 1111 1111
7FF
Zero
0 V
0000 0000 0000
000
Table 12. Ideal Input Voltages and Output Codes for 10-Bit Devices (ADS7954/55/56/57)
DESCRIPTION
ANALOG VALUE
DIGITAL OUTPUT
Full scale range
Range 1
→ Vref
Range 2
→ 2×Vref
STRAIGHT BINARY
Least significant bit (LSB)
Vref/1024
2Vref/1024
BINARY CODE
HEX CODE
Full scale
Vref – 1 LSB
2Vref – 1 LSB
11 1111 1111
3FF
Midscale
Vref/2
Vref
10 0000 0000
200
Midscale – 1 LSB
Vref/2 – 1 LSB
Vref – 1 LSB
01 1111 1111
1FF
Zero
0 V
00 0000 0000
000
42
Copyright 2008–2010, Texas Instruments Incorporated
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ADS7953SDBTRG4 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 12B 1MSPS 12Ch sr i/f SAR ADC RoHS:否 制造商:Texas Instruments 通道數(shù)量:2 結(jié)構(gòu):Sigma-Delta 轉(zhuǎn)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(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-32
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