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| 型號(hào)： | AD7799 |
| 廠商： | Analog Devices, Inc. |
| 英文描述： | Low Power, 24-Bit/16-Bit Sigma-Delta ADC with In-Amp |
| 中文描述： | 低功耗，24-Bit/16-BitΣ-Δ型ADC在放大器 |
| 文件頁(yè)數(shù)： | 15/17頁(yè) |
| 文件大小： | 499K |
| 代理商： | AD7799 |
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Preliminary Technical Data
AD7798/AD7799
Table 10
.
Update Rates Available
FS3
FS2
0
0
0
0
0
0
0
0
0
1
0
1
0
1
0
1
1
0
1
0
1
0
1
0
1
1
1
1
1
1
1
1
REV. PrD. Page 15 of 17
FS1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
FS0
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
f
ADC
(Hz)
x
500
250
125
62.5
50
41.6
33.3
19.6
16.6
16.6
12.5
10
8.33
6.25
4.17
Tsettle
(ms)
x
5
8
16
32
40
48
60
101
120
120
160
200
240
320
480
Rejection @50 Hz/60 Hz
90 dB (60 Hz only)
84 dB (50 Hz only)
70 dB (50 Hz and 60 Hz)
67 dB (50 Hz and 60 Hz)
69 dB (50 Hz and 60 Hz)
73 dB (50 Hz and 60 Hz)
74 dB (50 Hz and 60 Hz)
75 dB @ 50/60 Hz
CONFIGURATION REGISTER (RS2, RS1, RS0 = 0, 1, 0; POWER-ON/RESET = 0x0710)
The configuration register is a 16-bit register from which data can be read or to which data can be written. This register 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 ana-
log input channel. CON0 through CON15 indicate the bit locations, CON denoting 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.
CON15
0
CON7
0
Table 11. Configuration Register Bit Designations
Bit Location
Bit Name
CON15–CON14
0
CON13
BO
CON14
0
CON6
0
CON13
BO(0)
CON5
REF_DET(0)
CON12
U/B (0)
CON4
BUF(1)
CON11
0(0)
CON3
0(0)
CON10
G2(1)
CON2
CH2(0)
CON9
G1(1)
CON1
CH1(0)
CON8
G0(1)
CON0
CH0(0)
Description
These bits must be programmed with a logic 0 for correct operation.
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. The burnout currents
can be enabled only when the buffer or In-Amp is active.
Unipolar/Bipolar Bit.
Set
by user to enable unipolar coding, i.e., zero differential input will result in
0x0000(00) output and a full-scale differential input will result in 0XFFFF(FF) output for the
AD7798(99).
Cleared
by the user to enable bipolar coding. Negative full-scale differential input will result in an
output code of 0x0000(00), zero differential input will result in an output code of 0x8000(00), and
a positive full-scale differential input will result in an output code of 0xFFFF(FF) for the
AD7798(99).
This bit must be programmed with a Logic 0 for correct operation.
Gain Select Bits.
Written by the user to select the ADC input range as follows
G2
G1
G0
Gain
ADC Input Range (2.5V Reference)
0
0
0
1 (In-Amp not
used)
0
0
1
2 (In-Amp not
used)
CON12
U/B
CON11
CON10-CON8
0
G2-G0
±2.5 V
±1.25 V
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