MAX1284-MAX1285 Datasheet, PDF (7/15 Pages) Maxim Integrated Products – 400ksps/300ksps, Single-Supply, Low-Power, Serial 12-Bit ADCs with Internal Reference

400ksps/300ksps, Single-Supply, Low-Power,
Serial 12-Bit ADCs with Internal Reference
Typical Operating Characteristics (continued)
(MAX1284: V_DD = +5.0V, f_SCLK = 6.4MHz, MAX1285: V_DD = +3.0V, f_SCLK = 4.8MHz; C_LOAD = 20pF, 4.7µF capacitor at REF,
T_A = +25°C, unless otherwise noted.)
SUPPLY CURRENT vs. SUPPLY VOLTAGE
3.00
CODE = 1111 1111 1111 CONVERTING
R_L = ∞
2.75 _{CL = 10pF}
SCLK = 6.4MHz
2.50
2.25
CONVERTING
SCLK = 4.8MHz
2.00
1.75
STATIC
1.50
2.5 3.0 3.5 4.0 4.5 5.0 5.5
SUPPLY VOLTAGE (V)
SUPPLY CURRENT vs. TEMPERATURE
3.0
V_DD = 5V, CONVERTING
2.7
2.4 _{VDD = 3V, CONVERTING}
2.1
1.8 _{VDD = 5V, STATIC VDD = 3V, STATIC}
1.5
-40 -20
0 20 40 60
TEMPERATURE (°C)
80 100
Pin Description
PIN
NAME
FUNCTION
1
V_DD
Positive Supply Voltage
2
AIN
Sampling Analog Input, 0 to V_REF range
3
SHDN
Active-Low Shutdown Input. Pulling SHDN low shuts down the device and reduces the supply current
to 2µA (typ).
4
REF
Reference Voltage for Analog-to-Digital Conversion. Internal 2.5V reference output. Bypass with 4.7µF
capacitor.
5
GND Analog and Digital Ground
6
DOUT Serial Data Output DOUT changes state at SCLK’s rising edge High impedance when CS is high.
7
CS
Active-Low Chip Select. Initiates conversions on the falling edge. When CS is high, DOUT is high
impedance.
8
SCLK
Serial Clock Input. SCLK drives the conversion process and clocks data out at rates up to 6.4MHz
(MAX1284) or 4.8MHz (MAX1285).
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