Datasheet

REV. 0
–2–
AD7880–SPECIFICATIONS
Parameter B Versions
1
C Versions
1
Units Test Conditions/Comments
DYNAMIC PERFORMANCE
2
Signal-to-Noise Ratio
3
(SNR) 70 70 dB min Typically SNR Is 72 dB
V
IN
= 1 kHz Sine Wave, f
SAMPLE
= 66 kHz
Total Harmonic Distortion (THD) –80 –80 dB typ V
IN
= 1 kHz Sine Wave, f
SAMPLE
= 66 kHz
Peak Harmonic or Spurious Noise –80 –80 dB typ V
IN
= 1 kHz, f
SAMPLE
= 66 kHz
Intermodulation Distortion (IMD)
Second Order Terms –80 –80 dB typ fa = 0.983 kHz, fb = 1.05 kHz, f
SAMPLE
= 66 kHz
Third Order Terms –80 –80 dB typ fa = 0.983 kHz, fb = 1.05 kHz, f
SAMPLE
= 66 kHz
DC ACCURACY
Resolution 12 12 Bits All DC ACCURACY Specifications Apply for
the Three Analog Input Ranges
Integral Nonlinearity ±1 ±1 LSB max
Differential Nonlinearity ±1 ±1 LSB max Guaranteed Monotonic
Full-Scale Error ±15 ±5 LSB max
Bipolar Zero Error ±10 ±5 LSB max
Unipolar Offset Error ±5 ±5 LSB max
ANALOG INPUT
Input Voltage Ranges 0 to V
REF
0 to V
REF
Volts See Figure 5
0 to 2 V
REF
0 to 2 V
REF
Volts See Figure 6
±V
REF
±V
REF
Volts See Figure 7
Input Resistance 10 10 MΩ min 0 to V
REF
Range
5/12 5/12 kΩ min/max 8 kΩ typical: 0 to 2 V
REF
Range
5/12 5/12 kΩ min/max 8 kΩ typical: ±V
REF
Range
REFERENCE INPUT
V
REF
(For Specified Performance) 5 5 V ±5%: Normally V
REF
= V
DD
(See Reference Input Section)
I
REF
1.5 1.5 mA max
Nominal Reference Range 2.5/V
DD
2.5/V
DD
V min/max See Figure 3 for Degradation in Performance Down to 2.5 V
LOGIC INPUTS
CONVST, RD, CS, CLKIN
Input High Voltage, V
INH
2.4 2.4 V min
Input Low Voltage, V
INL
0.8 0.8 V max
Input Current, I
IN
±10 ±10 µA max V
IN
= 0 V or V
DD
Input Capacitance, C
IN
4
10 10 pF max
MODE INPUT
Input High Voltage, V
INH
4 4 V min
Input Low Voltage, V
INL
1 1 V max
Input Current, I
IN
±125 ±125 µA max V
IN
= 0 V or V
DD
Input Capacitance, C
IN
4
10 10 pF max
LOGIC OUTPUTS
DB11–DB0, BUSY
Output High Voltage, V
OH
4.0 4.0 V min I
SOURCE
= 400 µA
Output Low Voltage, V
OL
0.4 0.4 V max I
SINK
= 1.6 mA
DB11–DB0
Floating-State Leakage Current ±10 ±10 µA max
Floating-State Output Capacitance
4
10 10 pF max
CONVERSION
Conversion Time 12 12 µs max f
CLKIN
= 2.5 MHz
Track/Hold Acquisition Time 3 3 µs max
POWER REQUIREMENTS
V
DD
+5 +5 V nom ±5% for Specified Performance
I
DD
Normal Power Mode @ +25°C 7.5 7.5 mA max Typically 4 mA; MODE = V
DD
T
MIN
to T
MAX
10 10 mA max Typically 5 mA; MODE = V
DD
Power Save Mode @ +25°C 750 750 µA max Logic Inputs @ 0 V or V
DD
; MODE = 0 V
T
MIN
to T
MAX
1 1 mA max Logic Inputs @ 0 V or V
DD
; MODE = 0 V
Power Dissipation
Normal Power Mode @ +25°C 37.5 37.5 mW max V
DD
= 5 V: Typically 20 mW; MODE = V
DD
T
MIN
to T
MAX
50 50 mW max V
DD
= 5 V: Typically 25 mW; MODE = V
DD
Power Save Mode @ +25°C 3.75 3.75 mW max V
DD
= 5 V: Typically 2 mW; MODE = 0 V
T
MIN
to T
MAX
5 5 mW max V
DD
= 5 V: Typically 2.5 mW; MODE = 0 V
NOTES
1
Temperature ranges are as follows: B/C Versions, –40°C to +85°C.
2
V
IN
= 0 to V
REF
3
SNR calculation includes distortion and noise components.
4
Sample tested @ +25°C to ensure compliance.
Specifications subject to change without notice.
(V
DD
= +5 V 6 5%, V
REF
= V
DD
, AGND = DGND = O V, f
CLKIN
= 2.5 MHz, MODE = V
DD
unless otherwise noted. All Specifications T
MIN
to T
MAX
unless otherwise noted.)