Datasheet

–3–REV. D
AD977/AD977A
A Grade B Grade C Grade
Parameter Min Typ Max Min Typ Max Min Typ Max Unit
RESOLUTION 16 16 16 Bits
ANALOG INPUT
Voltage Range ±10 V, 0 V to 5 V, . . . (See Table II)
Impedance See Table II
Sampling Capacitance 40 40 40 pF
THROUGHPUT SPEED
Complete Cycle 5 5 5 µs
Throughput Rate 200 200 200 kHz
DC ACCURACY
Integral Linearity Error ± 3 ± 2.0 ± 3 LSB
1
Differential Linearity Error –2 +3 –1 +1.75 ± 2LSB
No Missing Codes 15 16 15 Bits
Transition Noise
2
1.0 1.0 1.0 LSB
Full-Scale Error
3, 4
± 0.5 ± 0.25 ± 0.5 %
Full-Scale Error Drift ±7 ±7 ± 7 ppm/°C
Full-Scale Error
Ext. REF = 2.5 V ± 0.5 ± 0.25 ± 0.5 %
Full-Scale Error Drift
Ext. REF = 2.5 V ±2 ±2 ±2 ppm/°C
Bipolar Zero Error
3
Bipolar Ranges ± 10 ± 10 ± 15 mV
Bipolar Zero Error Drift
Bipolar Ranges ±2 ±2 ±2 ppm/°C
Unipolar Zero Error
3
Unipolar Ranges ± 10 ± 10 ± 10 mV
Unipolar Zero Error Drift
Unipolar Ranges ± 2 ± 2 ± 2 ppm/°C
Recovery to Rated Accuracy
After Power-Down
5
2.2 µF to CAP 1 1 1 ms
Power Supply Sensitivity
V
ANA
= V
DIG
= V
D
= 5 V ± 5% ± 8 ± 8 ± 8LSB
AC ACCURACY
Spurious Free Dynamic Range
6
90 96 90 dB
7
Total Harmonic Distortion
6
–90 –96 –90 dB
Signal-to-(Noise+Distortion)
6
83 85 83 dB
–60 dB Input 27 28 27 dB
Signal-to-Noise
6
83 85 83 dB
Full Power Bandwidth
8
1 1 1 MHz
–3 dB Input Bandwidth 2.7 2.7 2.7 MHz
SAMPLING DYNAMICS
Aperture Delay 40 40 40 ns
Transient Response, Full-Scale Step 1 1 1 µs
Overvoltage Recovery
9
150 150 150 ns
REFERENCE
Internal Reference Voltage 2.48 2.5 2.52 2.48 2.5 2.52 2.48 2.5 2.52 V
Internal Reference Source Current 1 1 1 µA
External Reference Voltage Range
for Specified Linearity 2.3 2.5 2.7 2.3 2.5 2.7 2.3 2.5 2.7 V
External Reference Current Drain
Ext. REF = 2.5 V 1.2 1.2 1.2 mA
NOTES
1
LSB means Least Significant Bit. With a ± 10 V input, one LSB is 305 µV.
2
Typical rms noise at worst case transitions and temperatures.
3
Measured with fixed resistors as shown in Figures 11, 12 and 13. Adjustable to zero. Tested at room temperature.
4
Full-Scale Error is expressed as the % difference between the actual full-scale code transition voltage and the ideal full scale transition voltage, and includes the effect of offset
error. For bipolar input ranges, the Full-Scale Error is the worst case of either the –Full Scale or +Full Scale code transition voltage errors. For unipolar input ranges, Full-Scale
Error is with respect to the +Full-Scale code transition voltage.
5
External 2.5 V reference connected to REF.
6
f
IN
= 20 kHz, 0.5 dB down unless otherwise noted.
7
All specifications in dB are referred to a full scale ± 10 V input.
8
Full-Power Bandwidth is defined as full-scale input frequency at which Signal-to-(Noise+Distortion) degrades to 60 dB, or 10 bits of accuracy.
9
Recovers to specified performance after a 2 × F
S
input overvoltage.
Specifications subject to change without notice.
AD977A–SPECIFICATIONS
(–40C to +85C, F
S
= 200 kHz, V
DIG
= V
ANA
= 5 V, unless otherwise noted)