19-1638; Rev 2; 12/02
250ksps, +3V, 8-/4-Channel, 10-Bit ADCs
with +2.5V Reference and Parallel Interface
General Description
Features
The MAX1091/MAX1093 low-power, 10-bit analog-to-
digital converters (ADCs) feature a successive-approxi-
mation ADC, automatic power-down, fast wake-up
(2µs), an on-chip clock, +2.5V internal reference, and a
high-speed, byte-wide parallel interface. They operate
ꢀ 10-Bit Resolution, 0ꢀ. ꢁLB ꢁineꢂaitꢃ
ꢀ +3V Lingle-Lupplꢃ Opeaꢂtion
ꢀ Usea-Adjustꢂble ꢁogic ꢁevel (+1ꢀ8V to +3ꢀ6V)
ꢀ Inteanꢂl +2ꢀ.V Refeaence
with a single +3V analog supply and feature a V
LOGIC
pin that allows them to interface directly with a +1.8V to
+3.6V digital supply.
ꢀ Loftwꢂae-Configuaꢂble, Anꢂlog Input Multiplexea
8-Chꢂnnel Lingle-Ended/
Power consumption is only 5.7mW (V = V
) at the
LOGIC
DD
4-Chꢂnnel Pseudo-Diffeaentiꢂl (MAX1091)
4-Chꢂnnel Lingle-Ended/
2-Chꢂnnel Pseudo-Diffeaentiꢂl (MAX1093)
maximum sampling rate of 250ksps. Two software-selec-
table power-down modes enable the MAX1091/
MAX1093 to be shut down between conversions;
accessing the parallel interface returns them to normal
operation. Powering down between conversions can cut
supply current to under 10µA at reduced sampling rates.
ꢀ Loftwꢂae-Configuaꢂble, Unipolꢂa/Bipolꢂa Inputs
ꢀ ꢁow Powea
1ꢀ9mA (2.0ksps)
1ꢀ0mA (100ksps)
400µA (10ksps)
2µA (Lhutdown)
Both devices offer software-configurable analog inputs
for unipolar/bipolar and single-ended/pseudo-differen-
tial operation. In single-ended mode, the MAX1091 has
eight input channels and the MAX1093 has four input
channels (four and two input channels, respectively,
when in pseudo-differential mode).
ꢀ Inteanꢂl 3MHz Full-Powea Bꢂndwidth Taꢂck/Hold
ꢀ Bꢃte-Wide Pꢂaꢂllel (8 + 2) Inteafꢂce
Excellent dynamic performance and low power, com-
bined with ease of use and small package size, make
these converters ideal for battery-powered and data-
acquisition applications or for other circuits with demand-
ing power consumption and space requirements.
ꢀ Lmꢂll Footpaint: 28-Pin QLOP (MAX1091)
24-Pin QLOP (MAX1093)
Pin Configurations
The MAX1091/MAX1093 tri-states INT when CS goes
high. Refer to MAX1061/MAX1063 if tri-stating INT is not
desired.
TOP VIEW
HBEN
D7
1
2
3
4
5
6
24
23
V
V
LOGIC
DD
The MAX1091 is available in a 28-pin QSOP package,
while the MAX1093 is available in a 24-pin QSOP. For
pin-compatible +5V, 10-bit versions, refer to the
MAX1090/MAX1092 data sheet.
D6
22 REF
D5
21 REFADJ
20 GND
19 COM
D4
Applications
MAX1093
Industrial Control Systems
Energy Management
Data Logging
D3
Patient Monitoring
Touch Screens
D2
7
8
18 CH0
17 CH1
Data-Acquisition Systems
D1/D9
D0/D8
9
16 CH2
15 CH3
14 CS
Ordering Information
INT 10
RD 11
WR 12
INꢁ
PART
PIN-PACKAGE
TEMP RANGE
(ꢁLB)
0.5
1
0°C to +70°C
0°C to +70°C
MAX1091ACEI
MAX1091BCEI
MAX1091AEEI
MAX1091BEEI
28 QSOP
28 QSOP
28 QSOP
28 QSOP
13 CLK
QLOP
-40°C to +85°C
-40°C to +85°C
0.5
1
Pin Configurations continued at end of data sheet.
Ordering Information continued at end of data sheet.
Typical Operating Circuits appear at end of data sheet.
________________________________________________________________ Maxim Integrated Products
1
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.