(VDD = +5 V ؎ 5%, VSS = –5 V ؎ 5%, AGND = DGND = 0 V, fCLK is internal, unless
otherwise noted. All specifications TMIN to TMAX unless otherwise noted.)
AD7870A–SPECIFICATIONS
Parameter
J1
Units
Test Conditions/Comments
DYNAMIC PERFORMANCE2
Signal-to-Noise Ratio3 (SNR)
@ +25°C
70
70
–80
dB min
dB min
dB max
V
IN = 10 kHz Sine Wave, f SAMPLE = 100 kHz
Typically 71.5 dB for 0 < VIN ≤ 50 kHz
IN = 10 kHz Sine Wave, fSAMPLE = 100 kHz
Typically –86 dB for 0 < VIN < 50 kHz
VIN = 10 kHz, fSAMPLE = 100 kHz
TMIN to TMAX
Total Harmonic Distortion (THD)
V
Peak Harmonic or Spurious Noise
–80
dB max
Typically –86 dB for 0 < VIN < 50 kHz
Intermodulation Distortion (IMD)
Second Order Terms
Third Order Terms
–80
–80
2
dB max
dB max
µs max
fa = 9 kHz, fb = 9.5 kHz, fSAMPLE = 50 kHz
fa = 9 kHz, fb = 9.5 kHz, fSAMPLE = 50 kHz
Track/Hold Acquisition Time
DC ACCURACY
Resolution
12
12
Bits
Bits
Minimum Resolution for Which
No Missing Codes Are Guaranteed
Integral Nonlinearity
±1/2 LSB typ
Bipolar Zero Error
±5
±5
±5
LSB max
LSB max
LSB max
Positive Full-Scale Error4
Negative Full-Scale Error4
ANALOG INPUT
Input Voltage Range
Input Current
±3
Volts
±500 µA max
REFERENCE OUTPUT
REF OUT @ +25°C
2.99 V min
3.01 V max
REF OUT Tempco
Reference Load Sensitivity (∆REF OUT/∆I)
±60
±1
ppm/°C max
mV max
Reference Load Current Change (0 µA–500 µA)
Reference Load Should Not Be Change During Conversion
LOGIC INPUTS
Input High Voltage, VINH
Input Low Voltage, VINL
Input Current, IIN
2.4
0.8
±10
±10
10
V min
VDD = 5 V ± 5%
VDD = 5 V ± 5%
VIN = 0 V to VDD
VIN = VSS to VDD
V max
µA max
µA max
pF max
Input Current (12/8 CLK Input Only)
5
Input Capacitance, CIN
LOGIC OUTPUTS
Output High Voltage, VOH
Output Low Voltage, VOL
DB11–DB0
4.0
0.4
V min
V max
ISOURCE = 40 µA
ISINK = 1.6 mA
Floating State Leakage Current
±10
15
µA max
pF max
Floating-State Output Capacitance5
CONVERSION TIME
External Clock (fCLK = 2.5 MHz)
Internal Clock
7.6/8 µs min/µs max
8/10 µs min/µs max
POWER REQUIREMENTS
VDD
VSS
IDD
ISS
+5 V V nom
±5% for Specified Performance
±5% for Specified Performance
Typically 8 mA
Typically 4 mA
Typically 60 mW
–5
13
6
V non
mA max
mA max
mW max
Power Dissipation
95
NOTES
1Temperature range is as follow: J Version: 0°C to +70°C.
2VIN (pk-pk) = ±3 V.
3SNR calculation includes distortion and noise components.
4Measured with respect to internal reference and includes bipolar offset error.
5Sample tested @ +25°C to ensure compliance.
Specifications subject to change without notice.
REV. 0
–2–
ADI [ ADI ]
