Datasheet

MAX1377/MAX1379/MAX1383
Dual, 12-Bit, 1.25Msps Simultaneous-Sampling
ADCs with Serial Interface
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ELECTRICAL CHARACTERISTICS—MAX1379 (continued)
(V
AVDD
= 4.75V to 5.25V, V
L
= 3V, f
SCLK
= 20MHz (50% duty cycle), V
REF
= 4.096V, REFSEL = V
L
, S/D = DGND, C
REF
= 1µF; T
A
=
T
MIN
to T
MAX
, unless otherwise noted. Typical values are at T
A
= +25°C.)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
Normal operation 16 18
Partial power-down mode (Note 5) 2
mA
Analog Supply Current I
AVDD
Full power-down mode (Note 5) 5 µA
Average Static Supply Current 910mA
f
SCLK
= 20MHz, V
L
= 5V, C
L
= 30pF 2 3
Digital Supply Current I
VL
f
SCLK
= 20MHz, V
L
= 3V, C
L
= 30pF 1
mA
Power-Supply Rejection PSR V
AVDD
= 5V ±10%, full-scale input ±0.2 ±3 mV
ELECTRICAL CHARACTERISTICS—MAX1383
(V
AVDD
= 4.75V to 5.25V, V
L
= 1.8V to AVDD, f
SCLK
= 20MHz (50% duty cycle), V
REF
= 2.50V, REFSEL = V
L
, S/D = DGND, C
REF
=
1µF; T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at T
A
= +25°C.)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
DC ACCURACY
Resolution 12 Bits
Relative Accuracy INL (Note 1) -1.5 +1.5 LSB
Differential Nonlinearity DNL -1 +1.5 LSB
Unipolar ±12
Offset Error
Bipolar ±16
LSB
Offset-Error Matching ±10 LSB
Gain Error (Note 2) ±8 LSB
Gain-Error Matching (Note 2) ±6 LSB
Gain Temperature Coefficient ±2 ppm/
o
C
AIN1A to AIN1B, AIN2A to AIN2B 74
DC Input Isolation
AIN1A to AIN2A, AIN1B to AIN2B 80
dB
DYNAMIC SPECIFICATIONS (f
IN
= 100kHz, 20V
P-P
sine wave, 1.25Msps, 20MHz f
SCLK
)
Unipolar 67 71
Signal-to-Noise Plus Distortion SINAD
Bipolar 69 72
dB
Unipolar 67 71
Signal-to-Noise Ratio SNR
Bipolar 69 72
dB
Total Harmonic Distortion THD Up to the 5th harmonic -84 -72 dB
Spurious-Free Dynamic Range SFDR -86 -72 dB
Intermodulation Distortion IMD f
IN1
= 103.5kHz, f
IN2
= 113.5kHz -78 dB
Full-Power Bandwidth -3dB point 10 MHz
Full-Linear Bandwidth (S/N + D) > 68dB, 1V input 1 MHz
CONVERSION RATE (Figure 4)
Minimum Conversion Time t
CONV
16 clock cycles per conversion (Note 3) 0.800 µs
Dual output mode, S/D = 0 1.25
Maximum Throughput Rate
Single output mode, S/D = 1 0.625
Msps