16-Bit, 100 kSPS/200 kSPS
a
BiCMOS A/D Converter
AD977/AD977A
FEATURES FUNCTIONAL BLOCK DIAGRAM
Fast 16-Bit ADC
100 kSPS Throughput RateAD977 V
REF
ANA AGND1
200 kSPS Throughput RateAD977A
4k
Single 5 V Supply Operation 2.5V
AD977/
CAP
REFERENCE
Power Dissipation 100 mW Max AD977A
4R
R1
IN
Power-Down Mode 50 W
SYNC
2R
Input Ranges: R2 SERIAL
IN BUSY
DATA
SWITCHED
R
Unipolar; 0 V10 V, 0 V5 V and 0 V4 V 4R DATACLK
R3 INTERFACE
IN CAP ADC
DATA
Bipolar; 10 V, 5 V and 3.3 V
R = 5k AD977
Choice of External or Internal 2.5 V Reference
AGND2
R = 2.5k AD977A
High Speed Serial Interface
CONTROL LOGIC &
V
DIG CLOCK
On-Chip Clock
INTERNAL CALIBRATION CIRCUITRY
20-Lead Skinny DIP or SOIC Package
28-Lead Skinny SSOP Package
DGND PWRD R/CCS TAG SB/BTC EXT/INT
GENERAL DESCRIPTION PRODUCT HIGHLIGHTS
The AD977/AD977A is a high speed, low power 16-bit A/D 1. Fast Throughput
converter that operates from a single 5 V supply. The AD977A The AD977/AD977A is a high speed, 16-bit ADC based on
has a throughput rate of 200 kSPS whereas the AD977 has a a factory calibrated switched capacitor architecture.
throughput rate of 100 kSPS. Each part contains a successive
2. Single-Supply Operation
approximation, switched capacitor ADC, an internal 2.5 V
The AD977/AD977A operates from a single 5 V supply and
reference, and a high speed serial interface. The ADC is factory
dissipates only 100 mW max.
calibrated to minimize all linearity errors. The AD977/AD977A is
3. Comprehensive DC and AC Specifications
specified for full scale bipolar input ranges of 10 V, 5 V and
In addition to the traditional specifications of offset, gain
3.3 V, and unipolar ranges of 0 V to 10 V, 0 V to 5 V and
and linearity, the AD977/AD977A is fully tested for SNR
0 V to 4 V.
and THD.
The AD977/AD977A is comprehensively tested for ac param-
eters such as SNR and THD, as well as the more traditional dc
parameters of offset, gain and linearity.
REV. D
Information furnished by Analog Devices is believed to be accurate and
reliable. However, no responsibility is assumed by Analog Devices for its
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
use, nor for any infringements of patents or other rights of third parties
which may result from its use. No license is granted by implication or Tel: 781/329-4700 World Wide Web Site: AD977/AD977A
AD977SPECIFICATIONS (40C to +85C, F = 100 kHz, V = V = 5 V, unless otherwise noted)
S DIG ANA
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 10 10 10 s
Throughput Rate 100 100 100 kHz
DC ACCURACY
1
Integral Linearity Error 3 2.0 3 LSB
Differential Linearity Error 2 +3 1 +1.75 2 LSB
No Missing Codes 15 16 15 Bits
2
Transition Noise 1.0 1.0 1.0 LSB
3, 4
Full-Scale Error 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
3
Bipolar Zero Error
Bipolar Ranges 10 10 15 mV
Bipolar Zero Error Drift
Bipolar Ranges 2 2 2 ppm/C
3
Unipolar Zero Error
Unipolar Ranges 10 10 10 mV
Unipolar Zero Error Drift
Unipolar Ranges 2 2 2 ppm/C
Recovery to Rated Accuracy
5
After Power-Down
2.2 F to CAP 1 1 1 ms
Power Supply Sensitivity
V = V = V = 5 V 5% 8 8 8 LSB
ANA DIG D
AC ACCURACY
6 7
Spurious Free Dynamic Range 90 96 90 dB
6
Total Harmonic Distortion 90 96 90 dB
6
Signal-to-(Noise+Distortion) 83 85 83 dB
60 dB Input 27 28 27 dB
6
Signal-to-Noise 83 85 83 dB
8
Full Power Bandwidth 700 700 700 kHz
3 dB Input Bandwidth 1.5 1.5 1.5 MHz
SAMPLING DYNAMICS
Aperture Delay 40 40 40 ns
Transient Response, Full-Scale Step 2 2 2 s
9
Overvoltage Recovery 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 A
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 100 100 100 A
NOTES
1
LSB means Least Significant Bit. With a 10 V input, one LSB is 305 V.
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 = 20 kHz, 0.5 dB down unless otherwise noted.
IN
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 input overvoltage.
S
Specifications subject to change without notice.
2 REV. D