- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄362802 > EVAL-AD7888CB (Analog Devices, Inc.) +2.7 V to +5.25 V, Micropower, 8-Channel, 125 kSPS, 12-Bit ADC in 16-Lead TSSOP PDF資料下載
參數(shù)資料
| 型號： | EVAL-AD7888CB |
| 廠商： | Analog Devices, Inc. |
| 英文描述： | +2.7 V to +5.25 V, Micropower, 8-Channel, 125 kSPS, 12-Bit ADC in 16-Lead TSSOP |
| 中文描述： | 2.7 V至5.25 V，微功耗，8通道，125 kSPS的，12位ADC的16引腳TSSOP |
| 文件頁數(shù)： | 7/16頁 |
| 文件大?。?/td> | 164K |
| 代理商： | EVAL-AD7888CB |
REV. 0
AD7888
–7–
CONTROL REGISTER
The Control Register on the AD7888 is an 8-bit, write-only register. Data is loaded from the DIN pin of the AD7888 on the rising
edge of SCLK. The data is transferred on the DIN line at the same time as the conversion result is read from the part. This requires
16 serial clocks for every data transfer. Only the information provided on the first 8 rising clock edges (after
CS
falling edge) is loaded
to the Control Register. MSB denotes the first bit in the data stream. The bit functions are outlined in Table I. The default contents
of the Control Register on power-up is all zeros.
Table I. Control Register Bit Function Description
MSB
C
T
N
O
D
O
R
E
Z
2
D
D
A
1
D
D
A
0
D
D
A
F
E
R
1
M
P
0
M
P
Bit
7
Mnemonic
DONTC
Comment
Don’t Care. The value written to this bit of the Control Register is a don’t care, i.e., it doesn’t matter if the bit is
0 or 1.
A zero must be written to this bit to ensure correct operation of the AD7888.
These three address bits are loaded at the end of the present conversion sequence and select which analog input
channel is converted for the next conversion. The selected input channel is decoded as shown in Table II.
6
5
4
3
2
ZERO
ADD2
ADD1
ADD0
REF
Reference Bit. With a 0 in this bit, the on-chip reference is enabled. With a 1 in this bit, the on-chip reference
is disabled. To obtain best performance from the AD7888, the internal reference should be disabled when
using an externally applied reference source. (See On-Chip Reference section.)
Power Management Bits. These two bits decode the mode of operation of the AD7888 as shown in Table III.
1, 0
PM1, PM0
PERFORMANCE CURVES
Figure 2 shows a typical FFT plot for the AD7888 at 100 kHz
sample rate and 10 kHz input frequency.
FREQUENCY – kHz
–10
0
48.83
d
12.21
24.41
36.62
–30
–50
–70
–90
–110
4096 POINT FFT
SAMPLING
100kSPS
f
= 10kHz
SNR = 70dB
Figure 2. Dynamic Performance
Figure 3 shows a typical plot for the SNR vs. frequency for a
5 V supply and with a 5 V external reference.
INPUT FREQUENCY – kHz
71.00
42.14
S
73.0
72.5
72.0
71.5
10.89
31.59
V
DD
= +5V
5V EXT REFERENCE
21.14
Figure 3. SNR vs. Input Frequency
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| EVAL-AD7892-2CB | LC2MOS Single Supply, 12-Bit 600 kSPS ADC |
| EVAL-AD7892-3CB | LC2MOS Single Supply, 12-Bit 600 kSPS ADC |
| EVAL-AD7898CB | Evaluation Board for 5V, 12-Bit, Serial 220kSPS ADC in 8-Pin Package |
| EVAL-AD7899CB | Evaluation Board for 5V, 12-Bit, Serial 220kSPS ADC in 8-Pin Package |
| EVAL-AD7923CB2 | 4-Channel, 200 kSPS, 12-Bit ADC with Sequencer in 16-Lead TSSOP |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| EVAL-AD7890-2 | 制造商:Analog Devices 功能描述:AD7890 EVAL BOARD |
| EVAL-AD7891-1CB | 制造商:Analog Devices 功能描述:Evaluation Board For LC2MOS 8-Channel, 12-Bit High Speed Data Acquisition System 44PLCC 制造商:Analog Devices 功能描述:EVAL BD FOR LC2MOS 8CH, 12-BIT HS DATA ACQ SYS 44PLCC(P-44A) - Bulk |
| EVAL-AD7891-2CB | 制造商:Analog Devices 功能描述:EVALUATION BOARD LC2MOS 8-CHANNEL, 12-BIT HIGH SPEED DATA ACQUISITION SYSTEM 44PLCC(P-44A) 制造商:Analog Devices 功能描述:EVALUATION CONTROL BOARD - Bulk |
| EVAL-AD7892-2CB | 制造商:Analog Devices 功能描述:EVAL BD FOR AD7892 ADC - Bulk |
| EVAL-AD7892-3CB | 制造商:Analog Devices 功能描述:EVALUATION CONTROL BOARD I.C. - Bulk |
發(fā)布緊急采購，3分鐘左右您將得到回復。