V = +5 V ؎ 5%, GND = 0 V. Unipolar Input Range: V = GND, V (+) = 5 V,
DD
SS
REF
V (–) = GND. Bipolar Input Range: V = –5 V ؎ 5%, V (+) = 2.5 V,
V (–) = –2.5 V. These test conditions apply unless otherwise stated. All specifications TMIN to TMAX unless otherwise noted. Specifications
AD7821–SPECIFICATIONS
REF
SS
REF
REF
apply for RD Mode (Pin 7 = 0 V).
P aram eter
K Version 1
B, T Versions
Units
Com m ents
UNIPOLAR INPUT RANGE
Resolution2
8
±1
8
±1
Bits
LSB max
T otal Unadjusted Error3
Minimum Resolution for which
No Missing Codes are Guaranteed
8
8
Bits
BIPOLAR INPUT RANGE
Resolution2
8
8
Bits
Zero Code Error
Full Scale Error
±1
±1
45
–50
–50
±1
±1
45
–50
–50
LSB max
LSB max
dB min
dB max
dB max
Signal-to-Noise Ratio (SNR)3
T otal Harmonic Distortion (T HD)3
Peak Harmonic or Spurious Noise3
Intermodulation Distortion (IMD)3
VIN = 99.85 kHz Full-Scale Sine Wave with fSAMPLING = 500 kHz
VIN = 99.85 kHz Full-Scale Sine Wave with fSAMPLING = 500 kHz
VIN = 99.85 kHz Full-Scale Sine Wave with fSAMPLING = 500 kHz
fa (84.72 kHz) and fb (94.97 kHz) Full-Scale Sine Waves
with fSAMPLING = 500 kHz
–50
–50
1.6
–50
–50
1.6
dB max
dB max
V/µs max
V/µs typ
Second Order T erms
T hird Order T erms
Slew Rate, T racking3
2.36
2.36
REFERENCE INPUT
Input Resistance
VREF(+) Input Voltage Range
VREF(–) Input Voltage Range
1.0/4.0
VREF(–)/VDD
VSS/VREF(+)
1.0/4.0
VREF(–)/VDD
VSS/VREF(+)
kΩ min/kΩ max
V min/V max
V min/V max
ANALOG INPUT
Input Voltage Range
Input Leakage Current
Input Capacitance
V
±3
55
REF(–)/VREF(+) VREF(–)/VREF(+) V min/ max
±3
µA max
–5 V ≤ VIN ≤ +5 V
55
pF typ
LOGIC INPUT S
CS, WR, RD
VINH
2.4
0.8
1
3
–1
8
2.4
0.8
1
3
–1
8
V min
V max
µA max
µA max
µA max
pF max
VINL
IINH (CS, RD)
IINH (WR)
IINL
Input Capacitance4
MODE
T ypically 5 pF
VINH
VINL
IINH
IINL
3.5
1.5
200
–1
3.5
1.5
200
–1
V min
V max
µA max
µA max
pF max
50 µA typ
Input Capacitance4
8
8
T ypically 5 pF
LOGIC OUT PUT S
DB0–DB7, OFL, INT
VOH
VOL
4.0
0.4
±3
8
4.0
0.4
±3
8
V min
ISOURCE = 360 µA
ISINK = 1.6 mA
Floating State Leakage
T ypically 5 pF
V max
µA max
pF max
IOUT (DB0–DB7)
Output Capacitance4 (DB0–DB7)
RDY
VOL
IOUT
0.4
±3
8
0.4
±3
8
V max
µA max
pF max
ISINK = 2.6 mA
Floating State Leakage
T ypically 5 pF
Output Capacitance4
POWER SUPPLY
5
IDD
ISS
15
100
50
20
100
50
mA max
µA max
mW typ
LSB max
CS = RD = 0 V
CS = RD = 0 V
Power Dissipation
Power Supply Sensitivity
±1/4
±1/4
±1/16 LSB typ, VDD = 4.75 V to 5.25 V,
(VREF(+) = 4.75 V max for Unipolar Mode)
NOT ES
1T emperature Ranges are as follows: K Version = –40°C to +85°C; B Version = –40°C to +85°C; T Version = –55°C to +125°C.
21 LSB = 19.53 mV for both the unipolar (0 V to +5 V) and bipolar (–2.5 V to +2.5 V) input ranges.
3See T erminology.
4Sample tested at +25°C to ensure compliance.
5See T ypical Performance Characteristics.
Specifications subject to change without notice.
–2–
REV. A
ADI [ ADI ]
