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參數資料
型號: AD7729AR
廠商: ANALOG DEVICES INC
元件分類: 模擬信號調理
英文描述: Dual Sigma-Delta ADC with Auxiliary DAC
中文描述: SPECIALTY ANALOG CIRCUIT, PDSO28
封裝: SOIC-28
文件頁數: 2/16頁
文件大小: 142K
代理商: AD7729AR
–2–
REV. 0
AD7729–SPECIFICATIONS
1
0 V, f
CLK
= 13 MHz; RxPOWER1 = 0; RxPOWER0 = 1; MCLKDIV = 0; T
A
= T
MIN
to T
MAX
unless otherwise noted)
Parameter
AD7729A
Units
Test Conditions/Comments
REFERENCE
REFCAP
Absolute Voltage, V
REFCAP
REFCAP TC
REFOUT
Absolute Voltage, V
REFOUT
REFOUT TC
1.3
±
5%
50
V min/max
ppm/
°
C typ
0.1
μ
F Capacitor Required from REFCAP to AGND
1.3
±
10%
50
V min/max
ppm/
°
C typ
0.1
μ
F Capacitor Required from REFOUT to AGND
ADC CHANNEL SPECIFICATIONS
Resolution
ADC Signal Range
V
BIAS
RxON = 1
15
2 V
REFCAP
V
REFCAP
/2 to (AVDD – V
REFCAP
/2)
V
REFCAP
to (AVDD – V
REFCAP
)
V
BIAS
±
V
REFCAP
/2
V
BIAS
±
V
REFCAP
13
270.83
Bits
V p-p
Volts
Volts
V min/max
V min/max
MSPS
kHz
Differential
Single-Ended
For Both Positive and Negative Analog Inputs
For Positive Analog Inputs; Negative Analog Inputs = V
BIAS
Differential Signal Range
Single-Ended Signal Range
Input Sample Rate
Output Word Rate
DC Accuracy
Precalibration Offset Error
Post Calibration Offset Error
Post Calibration Offset Error TC
Input Resistance (DC)
Input Capacitance
Dynamic Specifications
Dynamic Range
Signal to (Noise + Distortion)
Gain Error
±
45
±
10
50
1.23
10
mV typ
mV max
μ
V/
°
C typ
M
typ
pF typ
TC = Temperature Coefficient
Input Frequency = 67.7 kHz
67
64
±
1
±
0.5
±
0.2
47
dB typ
dB min
dB max
dB max
dB max
μ
s typ
Input Frequency = 67.7 kHz, wrt 1.3 V
Input Frequency = 67.7 kHz, wrt V
REFCAP
Gain Match Between Channels
Filter Settling Time
Frequency Response
0 kHz–70 kHz
85 kHz
96 kHz
135 kHz
>170 kHz
Absolute Group Delay
Group Delay Between Channels
(0 kHz–96 kHz)
Coding
Does Not Include Input Antialias RC Circuit
±
0.05
–1
–3.0
–55
–55
23
dB max/min
dB max
dB max
dB max
dB max
μ
s typ
5
Twos Complement
ns typ
AUXILIARY CONVERTER
2
Resolution
Output Range
Code 000
Offset Error
Code 3FF
Gain Error
10
Bits
2/32
×
V
REFCAP
±
35
2 V
REFCAP
–60
+100
V
mV max
V
mV min
mV max
DC Accuracy
Maximum Output for Specified Accuracy = AVDD –
0.2 V or 2.6 V, Whichever Is Lower
Integral Nonlinearity
Differential Nonlinearity
Update Rate
Load Resistance
Load Capacitance
I
SINK
Full-Scale Settling Time
LSB Settling Time
Coding
±
4
±
2
540
10
50
50
4
2
Binary
LSB max
LSB max
kHz max
k
min
pF max
μ
A typ
μ
s typ
μ
s typ
Guaranteed Monotonic to 9 Bits
See Figure 1
See Figure 1
(AVDD1 = AVDD2 = +3 V
6
10%; DVDD1 = DVDD2 = +3 V
6
10%; DGND = AGND =
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AD7729ARU Dual Sigma-Delta ADC with Auxiliary DAC
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