AD7712 Analog Devices, AD7712 Datasheet - Page 4

• Manufacturer Part Number: AD7712
• Description: CMOS, 24-Bit Sigma-Delta, Signal Conditioning ADC with 2 Analog Input Channels
• Manufacturer: Analog Devices

Specifications of AD7712

• Resolution (bits): 24bit
• # Chan: 2
• Sample Rate: 19.5kSPS
• Interface: Ser
• Analog Input Type: Diff-Bip,Diff-Uni,SE-Bip
• Ain Range: Bip (Vref) x 4,Bip (Vref)/(PGA Gain),Bip 10V,Bip 20V,Uni (Vref) x 4,Uni (Vref)/(PGA Gain),Uni 10V,Uni 20V
• Adc Architecture: Sigma-Delta
• Pkg Type: DIP,SOIC

ABSOLUTE MAXIMUM RATINGS*
(T
AV
AV
AV
AV
DV
DV
V
V
AIN1 Input Voltage to AGND . . . V
Reference Input Voltage to AGND . . V
REF OUT to AGND . . . . . . . . . . . . . . . . . . . . –0.3 V to AV
AD7712–SPECIFICATIONS
Parameter
POWER REQUIREMENTS
NOTES
18
19
20
21
22
Specifications subject to change without notice.
CAUTION
ESD (electrostatic discharge) sensitive device. Electrostatic charges as high as 4000 V readily
accumulate on the human body and test equipment and can discharge without detection. Although the
AD7712 features proprietary ESD protection circuitry, permanent damage may occur on devices
subjected to high energy electrostatic discharges. Therefore, proper ESD precautions are recommended
to avoid performance degradation or loss of functionality.
than 10.5 V. Operating with AV
exceed 120 dB with filter notches of 10 Hz, 30 Hz, or 60 Hz.
(to 95 dB typ) by deriving the V
The AD7712 is specified with a 10 MHz clock for AV
The ± 5% tolerance on the DV
Measured at dc and applies in the selected passband. PSRR at 50 Hz will exceed 120 dB with filter notches of 10 Hz, 25 Hz, or 50 Hz. PSRR at 60 Hz will
PSRR depends on gain: gain of 1 = 70 dB typ; gain of 2 = 75 dB typ; gain of 4 = 80 dB typ; gains of 8 to 128 = 85 dB typ. These numbers can be improved
Using the hardware STANDBY pin. Standby power dissipation using the software standby bit (PD) of the Control Register is 8 mW typ.
SS
SS
A
Power Supply Voltages
Power Supply Currents
Power Supply Rejection
Power Dissipation
DD
DD
DD
DD
= 25°C, unless otherwise noted.)
DD
DD
to AGND . . . . . . . . . . . . . . . . . . . . . . . . . +0.3 V to –6 V
to DGND . . . . . . . . . . . . . . . . . . . . . . . . . +0.3 V to –6 V
Positive Supply (AV
Negative Supply (V
AV
DV
AV
AV
DV
V
Normal Mode
Normal Mode
Standby (Power-Down) Mode
SS
to DV
to V
to AGND . . . . . . . . . . . . . . . . . . . . . . –0.3 V to +12 V
to DGND . . . . . . . . . . . . . . . . . . . . . . –0.3 V to +12 V
to AGND . . . . . . . . . . . . . . . . . . . . . . . –0.3 V to +6 V
to DGND . . . . . . . . . . . . . . . . . . . . . . . –0.3 V to +6 V
DD
DD
DD
DD
DD
Current
– V
SS
Voltage
Current
Current
Voltage
DD
. . . . . . . . . . . . . . . . . . . . . . . . . . . –0.3 V to +12 V
SS
Voltage
. . . . . . . . . . . . . . . . . . . . . . . –0.3 V to +12 V
18
19
SS
DD
)
20
DD
DD
BIAS
and DV
input is allowed provided that DV
voltages in the range 5.25 V to 10.5 V is guaranteed only over the 0 C to 70 C temperature range.
voltage (via Zener diode or reference) from the AV
22
DD
Model
AD7712AN
AD7712AR
AD7712AR-REEL –40°C to +85°C
AD7712AR-REEL7 –40°C to +85°C
AD7712AQ
AD7712SQ
EVAL-AD7712EB Evaluation Board
*N = PDIP, Q = CERDIP; RW = SOIC.
)
21
SS
SS
– 0.3 V to AV
– 0.3 V to AV
A, S Versions
+5 to +10
+5
+10.5
4
4.5
1.5
90
45
52.5
200
DD
voltages of +5 V ± 5%. It is specified with an 8 MHz clock for AV
DD
DD
DD
1
ORDERING GUIDE
Temperature Range Package Options*
–40°C to +85°C
–40°C to +85°C
–40°C to +85°C
–55°C to +125°C
+ 0.3 V
+ 0.3 V
does not exceed AV
Unit
V nom
V nom
V max
mA max
mA max
mA max
dB typ
dB typ
mW max
mW max
µW max
DD
–4–
Digital Input Voltage to DGND . . . . . –0.3 V to AV
Digital Output Voltage to DGND . . . . –0.3 V to DV
Operating Temperature Range
Storage Temperature Range . . . . . . . . . . . . . –65°C to +150°C
Lead Temperature (Soldering, 10 secs) . . . . . . . . . . . . . 300°C
Power Dissipation (Any Package) to 75°C . . . . . . . . . . 450 mW
*Stresses above those listed under Absolute Maximum Ratings may cause perma-
nent damage to the device. This is a stress rating only; functional operation of the
device at these or any other conditions above those listed in the operational
sections of the specification is not implied. Exposure to absolute maximum rating
conditions for extended periods may affect device reliability.
DD
Commercial (A Version) . . . . . . . . . . . . . . . –40°C to +85°C
Extended (S Version) . . . . . . . . . . . . . . . . . –55°C to +125°C
Conditions/Comments
± 5% for Specified Performance
± 5% for Specified Performance
For Specified Performance
V
Rejection w.r.t. AGND; Assumes V
AV
AV
AV
supply.
SS
DD
DD
DD
DD
= –5 V
by more than 0.3 V.
= DV
= DV
= DV
N-24
RW-24
RW-24
RW-24
Q-24
Q-24
DD
DD
DD
= +5 V, V
= +5 V, V
= +5 V, V
SS
SS
SS
= –5 V; Typically 30 mW
= 0 V or –5 V; Typically 100 µW
= 0 V; Typically 25 mW
DD
voltages greater than 5.25 V and less
BIAS
Is Fixed
DD
DD
REV. F
+ 0.3 V
+ 0.3 V