MAX1275 Maxim Integrated Products, MAX1275 Datasheet - Page 8

• Manufacturer Part Number: MAX1275
• Description: (MAX1274 / MAX1275) 12-Bit ADCs
• Manufacturer: Maxim Integrated Products

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1.8Msps, Single-Supply, Low-Power,
True-Differential, 12-Bit ADCs
(V
at T
8
DD
A
_______________________________________________________________________________________
5, 11
= +5V, V
PIN
= +25°C)
10
12
—
1
2
3
4
6
7
8
9
L
= V
CNVST
NAME
RGND
DOUT
DD
SCLK
GND
AIN+
AIN-
N.C.
REF
V
EP
V
DD
, V
L
REF
1.0
0.8
0.6
0.4
0.2
0
-40
= 4.096V, f
Negative Analog Input
External Reference Voltage Input. V
capacitor and a 4.7µF capacitor to RGND.
Reference Ground. Connect RGND to GND.
Positive Analog Supply Voltage (+4.75V to +5.25V). Bypass V
capacitor to GND.
No Connection
Ground. GND is internally connected to EP.
Positive Logic Supply Voltage (1.8V to V
to GND.
Serial Data Output. Data is clocked out on the rising edge of SCLK.
Convert Start. Forcing CNVST high prepares the part for a conversion. Conversion begins on the
falling edge of CNVST. The sampling instant is defined by the falling edge of CNVST.
Serial Clock Input. Clocks data out of the serial interface. SCLK also sets the conversion speed.
Positive Analog Input
Exposed Paddle. EP is internally connected to GND.
-15
V
vs. TEMPERATURE
L
TEMPERATURE (°C)
SUPPLY CURRENT
SCLK
10
CONVERTING
f
SCLK
FULL/PARTIAL
POWER-DOWN
f
SCLK
= 28.8MHz
= 28.8MHz, T
35
= 28.8MHz
Typical Operating Characteristics (continued)
60
A
85
= T
MIN
REF
to T
sets the analog input range. Bypass REF with a 0.01µF
DD
MAX
1.0
0.8
0.5
0.3
). Bypass V
0
0
FUNCTION
, unless otherwise noted. Typical values are measured
vs. CONVERSION RATE
500
V
L
L
SUPPLY CURRENT
with a 0.01µF capacitor and a 10µF capacitor
f
SAMPLE
1000
DD
V
L
(kHz)
V
= 3V
L
with a 0.01µF capacitor and a 10µF
= 5V
1500
V
L
= 1.8V
Pin Description
2000