Datasheet

MAX1377/MAX1379/MAX1383
Dual, 12-Bit, 1.25Msps Simultaneous-Sampling
ADCs with Serial Interface
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ELECTRICAL CHARACTERISTICS—MAX1383 (continued)
(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
Minimum Throughput Rate for
Full Bandwidth Signal
(Note 4) 10 ksps
Track-and-Hold Acquisition Time t
ACQ
125 ns
Aperture Delay 2ns
Aperture-Delay Matching 2ns
Aperture Jitter (Note 5) 30 ps
External Clock Frequency f
SCLK
20 MHz
ANALOG INPUTS (AIN1A, AIN1B, AIN2A, AIN2B)
Input Range U/B = 0, V
AIN_A
- RGND -10 +10 V
Differential Input Range U/B = 1, V
AIN_A
- V
AIN_B
-10 +10 V
Absolute Voltage Range -10 +10 V
Input Impedance 10 kΩ
Input Capacitance At each analog input 10 pF
EXTERNAL REFERENCE (REFSEL = 1)
Absolute Input Voltage Range V
REF
1.25 2.5 V
Input Capacitance 50 pF
Input Current Time averaged at maximum throughput rate 1600 µA
INTERNAL REFERENCE (REFSEL = 0)
Reference Voltage Level 2.48 2.50 2.52 V
I
SOURCE
= 0 to 1mA 1
Load Regulation
I
SINK
= 0 to 50µA 1
mV/mA
Voltage Temperature Coefficient ±50.0 ppm/
o
C
DIGITAL INPUTS (SCLK, CNVST, U/B, S/D, SEL, REFSEL)
Input-Voltage Low V
IL
0.3 x V
L
V
Input-Voltage High V
IH
0.7 x V
L
V
Input Leakage Current I
IL
±10 µA
DIGITAL OUTPUTS (DOUT1, DOUT2)
Output Load Capacitance C
DOUT
For stated timing performance 30 pF
Output-Voltage Low V
OL
I
SINK
= 5mA 0.4 V
Output-Voltage High V
OH
I
SOURCE
= 1mA, V
L
≥ 2.7V V
L
- 0.5V V
Output Leakage Current I
OL
High-impedance mode (Figure 9) ±0.2 µA
POWER REQUIREMENTS
Analog Supply Voltage AVDD 4.75 5.0 5.25 V
Digital Supply Voltage V
L
1.8 AVDD V
Normal operation 55 65 mA
Analog Supply Current I
AVDD
Full power-down mode (Note 5) 0.5 10 µA
Average Static Supply Current 44 58 mA
Digital Supply Current I
VL
f
SCLK
= 20MHz, V
L
= 3V, C
L
= 30pF 2 3.0 mA
Power-Supply Rejection PSR V
AVDD
= 5V ±10%, full-scale input ±5 ±30 mV