參數(shù)資料
型號(hào)： AD7812YR
廠(chǎng)商： Analog Devices Inc
文件頁(yè)數(shù)： 5/24頁(yè)
文件大?。?/td> 0K
描述： IC ADC 10BIT 8-CHAN SRL 20-SOIC
產(chǎn)品變化通告： Product Discontinuance 27/Oct/2011
標(biāo)準(zhǔn)包裝： 37
位數(shù)： 10
采樣率（每秒）： 350k
數(shù)據(jù)接口： DSP，串行
轉(zhuǎn)換器數(shù)目： 1
功率耗散（最大）： 10.5mW
電壓電源： 單電源
工作溫度： -40°C ~ 105°C
安裝類(lèi)型： 表面貼裝
封裝/外殼： 20-SOIC（0.295"，7.50mm 寬）
供應(yīng)商設(shè)備封裝： 20-SOIC W
包裝： 管件
輸入數(shù)目和類(lèi)型： 8 個(gè)單端，單極；7 偽差分，單極
AD7811/AD7812
–13–
REV. B
t
POWER-UP
1.5 s
CONVST
t
CONVERT
2.3 s
100 s @ 10kSPS
POWER-DOWN
t
CYCLE
Figure 11. Automatic Power-Down
For example, if the AD7811 is operated in a continuous sam-
pling mode with a throughput rate of 10 kSPS, PD1 = 1,
PD0 = 0 and using the on chip reference the power consump-
tion is calculated as follows. The power dissipation during nor-
mal operation is 10.5 mW, VDD = 3 V. If the power-up time is
1.5
s and the conversion time is 2.3 s, the AD7811 can be
said to dissipate 10.5 mW for 3.8
s (worst-case) during each
conversion cycle. If the throughput rate is 10 kSPS, the cycle
time is 100
s and the average power dissipated during each
cycle is (3.8/100)
× (10.5 mW) = 400 W.
Figure 12 shows the Power vs. Throughput Rate for automatic
full power-down.
THROUGHPUT – kSPS
10
1
0.01
050
10
0.1
20
30
40
5
15
253545
POWER
–
mV
Figure 12. AD7811/AD7812 Power vs. Throughput
FREQUENCY – kHz
0
–10
–100
0
122
17
87
105
–40
–70
–80
–90
–20
–30
–60
–50
35
52
70
140
157
174
AD7811/12
2048 POINT FFT
SAMPLING 357.142kHz
fIN = 30.168kHz
dBs
Figure 13. AD7811/AD7812 SNR
QUICK EVALUATION SETUP
The schematic shown in Figure 14 shows a suggested configura-
tion of the AD7812 for a first look evaluation of the part. No
external reference circuit is needed as the V
REF pin can be
connected to V
DD. The CONVST signal is connected to TFS
and RFS to enable the serial port. Also by selecting Mode 2
operation (see Operating Modes section) the power performance
of the AD7812 can be evaluated.
10 F
10nF
VREF
DIN
SCLK
CONVST
VDD
CREF
VIN1
AGND
TFS
RFS
DOUT
A0
DGND
0.1 F
VIN2
AD7812
0V TO VDD
INPUT
VIN7
VIN8
SUPPLY
VDD
Figure 14. Evaluation Quick Setup
The setup uses a full duplex, 16-bit, serial interface protocol,
e.g., SPI. It is possible to use 8-bit transfers by carrying out two
consecutive read/write operations. The MSB of data is trans-
ferred first.
1. When power is first connected to the device it is in a powered
down mode of operation and is consuming only 1
A. The
AD7812 must first be configured by carrying out a serial
write operation.
2. The
CONVST signal is first pulsed to enable the serial port
(rising and falling edge on RFS and TFS respectively—see
Serial Interface section).
3. Next, a 16-bit serial read/write operation is carried out. By
writing 6040 Hex to the AD7812 the part is powered up, set
up to use external reference (i.e., VDD) and the analog input
VIN1 is selected. The data read from the part during this read/
write operation is invalid.
4. It is necessary to wait approximately 1.5
s before pulsing
CONVST again and initiating a conversion. The 1.5
s is to
allow the AD7812 to power up correctly—see Power-Up
Times section.
5. Approximately 2.3
s after the falling edge of CONVST, i.e.,
after the end of the conversion, a serial read/write can take
place. This time 4040 Hex is written to the AD7812 and the
data read from the part is the result of the conversion. The
output code is in a straight binary format and will be left
justified in the 16-bit serial register (MSB clocked out first).
6. By idling the
CONVST signal high or low it is possible to
operate the AD7812 in Mode 1 and Mode 2 respectively.
C
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