MAX1225 Maxim Integrated Products, MAX1225 Datasheet - Page 8

• Manufacturer Part Number: MAX1225
• Description: (MAX1224 / MAX1225) 12-Bit ADCs
• Manufacturer: Maxim Integrated Products

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1.5Msps, Single-Supply, Low-Power,
True-Differential, 12-Bit ADCs
(V
ues are measured at T
8
DD
_______________________________________________________________________________________
5, 11
9
6
3
0
= +3V, V
PIN
10
12
—
1
2
3
4
6
7
8
9
0
250
L
V
vs. CONVERSION RATE
DD
= V
500
SUPPLY CURRENT
CNVST
NAME
RGND
DOUT
DD
f
SCLK
AIN+
GND
SAMPLE
AIN-
N.C.
V
REF
V
EP
DD
, V
A
L
750
= +25°C)
REF
(kHz)
1000
= 2.048V, 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 (+2.7V to +3.6V). 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.
1250
1500
SCLK
= 24MHz, f
0.5
0.4
0.3
0.2
0.1
Typical Operating Characteristics (continued)
0
-40
V
L
SUPPLY CURRENT vs. TEMPERATURE
SAMPLE
-15
CONVERSION, V
CONVERSION, V
TEMPERATURE (°C)
10
= 1.5Msps, T
REF
L
L
= 3V
= 1.8V
sets the analog input range. Bypass REF with a 0.01µF
DD
35
). Bypass V
FUNCTION
60
A
= T
MIN
85
L
with a 0.01µF capacitor and a 10µF capacitor
to T
DD
MAX
250
200
150
100
with a 0.01µF capacitor and a 10µF
50
0
, unless otherwise noted. Typical val-
0
250
vs. CONVERSION RATE
V
L
Pin Description
V
SUPPLY CURRENT
500
L
= 3V
f
SAMPLE
750
(kHz)
100
V
L
= 1.8V
1250
1500