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参数资料
| 型号： | AD7797BRUZ-REEL |
| 厂商： | Analog Devices Inc |
| 文件页数： | 6/24页 |
| 文件大小： | 0K |
| 描述： | IC ADC 24BIT SIG-DEL 1CH 16TSSOP |
| 标准包装： | 2,500 |
| 位数： | 24 |
| 采样率（每秒）： | 123 |
| 数据接口： | DSP，MICROWIRE?，QSPI?，串行，SPI? |
| 转换器数目： | 1 |
| 功率耗散（最大）： | 1.6mW |
| 电压电源： | 模拟和数字 |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 16-TSSOP（0.173"，4.40mm 宽） |
| 供应商设备封装： | 16-TSSOP |
| 包装： | 带卷 (TR) |
| 输入数目和类型： | 1 个差分，单极；1 个差分，双极 |
| 配用： | EVAL-AD7797EBZ-ND - BOARD EVALUATION FOR AD7797 |
AD7796/AD7797
Rev. A | Page 14 of 24
CONFIGURATION REGISTER
RS2, RS1, RS0 = 0, 1, 0; Power-On/Reset = 0x0710
The configuration register is a 16-bit read/write register. This register is used to configure the ADC for unipolar or bipolar mode, enable
or disable the burnout currents, and select the analog input channel. Table 15 outlines the bit designations for the configuration register.
CON0 through CON15 indicate the bit locations, with CON denoting that the bits are in the configuration register. CON15 denotes the
first bit of the data stream. The number in brackets indicates the power-on/reset default status of that bit.
MSB
LSB
CON15
CON14
CON13
CON12
CON11
CON10
CON9
CON8
CON7
CON6
CON5
CON4
CON3
CON2
CON1
CON0
0(0)
BO(0)
U/B(0)
0(0)
1(1)
0(0)
1(1)
0(0)
CH2(0)
CH1(0)
CH0(0)
Table 15. Configuration Register Bit Designations
Bit Location
Bit Name
Description
CON15 to CON14
0
These bits must be programmed with a Logic 0 for correct operation.
CON13
BO
Burnout Current Enable Bit. When this bit is set to 1 by the user, the 100 nA current sources in the signal
path are enabled. When BO = 0, the burnout currents are disabled.
CON12
U/B
Unipolar/Bipolar Bit. Set by user to enable unipolar coding, that is, a zero differential input results in
0x0000(00) output, and a full-scale differential input results in 0xFFFF(FF) output. Cleared by the user to
enable bipolar coding. A negative full-scale differential input results in an output code of 0x0000(00), a
zero differential input results in an output code of 0x8000(00), and a positive full-scale differential input
results in an output code of 0xFFFF(FF).
CON11
0
This bit must be programmed with a Logic 0 for correct operation.
CON10 to CON8
1
These bits must be programmed with a Logic 1 for correct operation.
CON7 to CON5
0
These bits must be programmed with a Logic 0 for correct operation.
CON4
1
This bit must be programmed with a Logic 1 for correct operation.
CON3
0
This bit must be programmed with a Logic 0 for correct operation.
CON2 to CON0
CH2 to CH0
Channel Select bits. Written by the user to select the active analog input channel to the ADC.
CH2
CH1
CH0
Channel
0
AIN(+) AIN(–)
0
1
Reserved
0
1
0
Reserved
0
1
AIN(–) AIN(–)
1
0
Reserved
1
0
1
Reserved
1
0
Temp Sensor
1
AVDD Monitor
DATA REGISTER
RS2, RS1, RS0 = 0, 1, 1; Power-On/Reset = 0x0000 (AD7796)/0x000000 (AD7797)
The conversion result from the ADC is stored in this data register. This is a read-only register. On completion of a read operation from
this register, the RDY bit/pin is set.
ID REGISTER
RS2, RS1, RS0 = 1, 0, 0; Power-On/Reset = 0x5A (AD7796)/0x5B (AD7797)
The identification number for the AD7796/AD7797 is stored in the ID register. This is a read-only register.
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