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| 型號(hào)： | AD7795BRUZ-REEL |
| 廠商： | Analog Devices Inc |
| 文件頁(yè)數(shù)： | 16/37頁(yè) |
| 文件大?。?/td> | 0K |
| 描述： | IC ADC 16BIT 6CH LOW-PWR 24TSSOP |
| 標(biāo)準(zhǔn)包裝： | 2,500 |
| 位數(shù)： | 16 |
| 采樣率（每秒）： | 470 |
| 數(shù)據(jù)接口： | DSP，MICROWIRE?，QSPI?，串行，SPI? |
| 轉(zhuǎn)換器數(shù)目： | 1 |
| 功率耗散（最大）： | 2.5mW |
| 電壓電源： | 模擬和數(shù)字 |
| 工作溫度： | -40°C ~ 105°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 24-TSSOP（0.173"，4.40mm 寬） |
| 供應(yīng)商設(shè)備封裝： | 24-TSSOP |
| 包裝： | 帶卷 (TR) |
| 輸入數(shù)目和類型： | 6 個(gè)差分，單極；6 個(gè)差分，雙極 |
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AD7794/AD7795
Rev. D | Page 22 of 36
CONFIGURATION REGISTER
RS2, RS1, RS0 = 0, 1, 0; Power-On/Reset = 0x0710
The configuration register is a 16-bit read/write register that is
used to configure the ADC for unipolar or bipolar mode, enable
or disable the buffer, enable or disable the burnout currents,
select the gain, and select the analog input channel.
Table 20 outlines the bit designations for the filter register.
CON0 through CON15 indicate the bit locations. CON denotes
that the bits are in the configuration register. CON15 is the first
bit of the data stream. The number in parentheses indicates the
power-on/reset default status of that bit.
CON15
CON14
CON13
CON12
CON11
CON10
CON9
CON8
VBIAS1(0)
VBIAS0(0)
BO(0)
U/B(0)
BOOST(0)
G2(1)
G1(1)
G0(1)
CON7
CON6
CON5
CON4
CON3
CON2
CON1
CON0
REFSEL1(0)
REFSEL0(0)
REF_DET(0)
BUF(1)
CH3(0)
CH2(0)
CH1(0)
CH0(0)
Table 20. Configuration Register Bit Designations
Bit No.
Mnemonic
Description
CON15 to
CON14
VBIAS1 to VBIAS0
Bias Voltage Generator Enable. The negative terminal of the analog inputs can be biased up to AVDD/2.
These bits are used in conjunction with the BOOST bit.
VBIAS1
VBIAS0
Bias Voltage
0
Bias voltage generator disabled
0
1
Bias voltage generator connected to AIN1()
1
0
Bias voltage generator connected to AIN2()
1
Bias voltage generator connected to AIN3()
CON13
BO
Burnout Current Enable Bit. This bit must be programmed with a Logic 0 for correct operation. 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. The burnout currents can be enabled only when the buffer or in-amp is active.
CON12
U/B
Unipolar/Bipolar Bit. Set by user to enable unipolar coding, that is, zero differential input results in
0x000000 output and a full-scale differential input results in 0xFFFFFF output. Cleared by the user to
enable bipolar coding. Negative full-scale differential input results in an output code of 0x000000, zero
differential input results in an output code of 0x800000, and positive full-scale differential input results in
an output code of 0xFFFFFF.
CON11
BOOST
This bit is used in conjunction with the VBIAS1 and VBIAS0 bits. When set, the current consumed by the
bias voltage generator is increased, which reduces its power-up time.
CON10 to
CON8
G2 to G0
Gain Select Bits.
Written by the user to select the ADC input range as follows:
G2
G1
G0
Gain
ADC Input Range (2.5 V Reference)
0
1 (in-amp not
used)
2.5 V
0
1
2 (in-amp not
used)
1.25 V
0
1
0
4
625 mV
0
1
8
312.5 mV
1
0
16
156.2 mV
1
0
1
32
78.125 mV
1
0
64
39.06 mV
1
128
19.53 mV
CON7 to
CON6
REFSEL1/REFSEL0
Reference Select Bits.
The reference source for the ADC is selected using these bits.
REFSEL1
REFSEL0
Reference Source
0
External reference applied between REFIN1(+) and REFIN1()
0
1
External reference applied between REFIN2(+) and REFIN2()
1
0
Internal 1.17 V reference
1
Reserved
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