AD7720 Analog Devices, AD7720 Datasheet - Page 3

• Manufacturer Part Number: AD7720
• Description: CMOS Sigma-Delta Modulator with 90 dB Dynamic Range
• Manufacturer: Analog Devices

Specifications of AD7720

• Resolution (bits): 16bit
• # Chan: 1
• Sample Rate: 25MSPS
• Interface: Ser
• Analog Input Type: Diff-Bip,Diff-Uni
• Ain Range: (Vref) p-p,2.5V p-p,Uni (Vref),Uni 2.5V
• Adc Architecture: Sigma-Delta Modulator
• Pkg Type: SOP

Parameter
LOGIC INPUTS
LOGIC OUTPUTS
POWER SUPPLIES
NOTES
1
2
3
4
5
Specifications subject to change without notice.
REV. 0
Operating temperature range is as follows: B Version: –40 C to +85 C.
Gain Error excludes reference error. The modulator gain is calibrated w.r.t. the voltage on the REF2 pin.
Applies after calibration at temperature of interest.
Measurement Bandwidth = 0.5
T
A
V
V
I
C
V
V
AVDD
DVDD
I
Active Mode
Standby Mode
INH
DD
= +25 C to +85 C/T
IH
IL
OH
OL
IN
, Input Low Voltage
, Input High Voltage
, Input Capacitance
, Output Low Voltage
(Total for AVDD, DVDD)
, Input Current
, Output High Voltage
BIT STREAM
Figure 1. Digital Filter (Consists of 2 FIR Filters). This filter is implemented on the AD7722.
A
= T
MIN
BANDWIDTH = 90.625 kHz
TRANSITION = 292.969kHz
ATTENUATION = 120dB
COEFFICIENTS = 384
FILTER 1
f
90.625kHz
to T
MCLK
MAX
; Input Level = –0.05 dB.
.
292.969kHz
B Version
2
0.8
10
10
2.4
0.4
4.75/5.25
4.75/5.25
43
25
120dB
DECIMATE
BY 32
Units
V min
V max
pF max
V min
V max
V min/V max
V min/V max
mA max
A max
A max
–3–
BANDWIDTH = 90.625 kHz
TRANSITION = 104.687kHz
ATTENUATION = 90dB
COEFFICIENTS = 151
FILTER 2
90.625kHz
Test Conditions/Comments
|I
|I
Digital Inputs Equal to 0 V or DVDD
OUT
OUT
104.687kHz
|
|
90dB
200 A
1.6 mA
DECIMATE
BY 2
OUTPUT
16-BIT
AD7720