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General Description
The MAX1084/MAX1085 10-bit analog-to-digital convert-
ers (ADCs) combine a high-bandwidth track/hold, a serial
interface with high conversion speed, an internal +2.5V
reference, and low power consumption. The MAX1084
operates from a single +4.5V to +5.5V supply; the
MAX1085 operates from a single +2.7V to +3.6V supply.
The 3-wire serial interface connects directly to
SPITM/QSPITM/MICROWIRETM devices without external
logic. The devices use an external serial-interface clock to
perform successive-approximation analog-to-digital con-
versions.
Low power combined with ease of use and small pack-
age size make these converters ideal for remote-sensor
and data-acquisition applications, or for other circuits with
demanding power consumption and space requirements.
The MAX1084/MAX1085 are available in 8-pin SO
packages.
These devices are pin-compatible, higher-speed versions
of the MAX1242/MAX1243; for more information, refer to
the respective data sheets.
Applications
Portable Data Logging
Data Acquisition
Medical Instruments
Battery-Powered Instruments
Pen Digitizers
Process Control
Features
o Single-Supply Operation
+4.5V to +5.5V (MAX1084)
+2.7V to +3.6V (MAX1085)
o 10-Bit Resolution
o 400ksps Sampling Rate (MAX1084)
o Internal Track/Hold
o Internal +2.5V Reference
o Low Power: 2.5mA (400ksps)
o SPI/QSPI/MICROWIRE 3-Wire Serial Interface
o Pin-Compatible, High-Speed Upgrade to
MAX1242/MAX1243
o 8-Pin SO Package
MAX1084/MAX1085
400ksps/300ksps, Single-Supply, Low-Power,
Serial 10-Bit ADCs with Internal Reference
________________________________________________________________ Maxim Integrated Products
1
19-1686; Rev 0; 5/00
PART
MAX1084ACSA
MAX1084BCSA
MAX1084AESA
-40C to +85C
0C to +70C
0C to +70C
TEMP.
RANGE
PIN-
PACKAGE
8 SO
8 SO
8 SO
Pin Configuration
Ordering Information
INL
(LSB)
1/2
1
1/2
MAX1084BESA
MAX1085ACSA
MAX1085BCSA
0C to +70C
0C to +70C
-40C to +85C
8 SO
8 SO
8 SO
1
1/2
1
MAX1085AESA
MAX1085BESA
-40C to +85C
-40C to +85C
8 SO
8 SO
1/2
1
7
AIN
T/H
DOUT
6
1
5
OUTPUT
SHIFT
REGISTER
CONTROL
LOGIC
2.5V
REFERENCE
INT
CLOCK
10-BIT
SAR
8
2
3
REF
4
SHDN
SCLK
CS
MAX1084
MAX1085
V
DD
GND
Functional Diagram
SPI and QSPI are trademarks of Motorola, Inc.
MICROWIRE is a trademark of National Semiconductor Corp.
TOP VIEW
1
2
3
4
8
7
6
5
SCLK
CS
DOUT
GND
REF
SHDN
AIN
V
DD
SO
MAX1084
MAX1085
MAX1084/MAX1085
400ksps/300ksps, Single-Supply, Low-Power,
Serial 10-Bit ADCs with Internal Reference
2
_______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS--MAX1084
(V
DD
= +4.5V to +5.5V, f
SCLK
= 6.4MHz, 50% duty cycle, 16 clocks/conversion cycle (400ksps), 4.7F capacitor at REF, T
A
= T
MIN
to
T
MAX
, unless otherwise noted. Typical values are at T
A
= +25C.)
Stresses beyond those listed under "Absolute Maximum Ratings" may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
V
DD
to GND .............................................................-0.3V to +6V
AIN to GND................................................-0.3V to (V
DD
+ 0.3V)
REF to GND ...............................................-0.3V to (V
DD
+ 0.3V)
Digital Inputs to GND...............................................-0.3V to +6V
DOUT to GND............................................-0.3V to (V
DD
+ 0.3V)
DOUT Current ..................................................................25mA
Continuous Power Dissipation (T
A
= +70C)
8-Pin SO (derate 5.88mW/C above +70C) ..............471mW
Operating Temperature Ranges
MAX1084_CSA/MAX1085_CSA.........................0C to +70C
MAX1084_ESA/MAX1085_ESA ......................-40C to +85C
Storage Temperature Range............................-60C to +150C
Lead Temperature (soldering, 10s) ................................+300C
MAX1084A
SINAD > 58dB
-3dB point
Up to the 5th harmonic
f
IN1
= 99kHz, f
IN2
=102kHz
MAX1084B
No missing codes over temperature
CONDITIONS
%
40 60
Duty Cycle
MHz
0.5
6.4
f
SCLK
Serial Clock Frequency
ps
<50
Aperture Jitter
ns
10
Aperture Delay
ns
468
t
ACQ
Track/Hold Acquisition Time
s
2.5
t
CONV
Conversion Time (Note 4)
kHz
350
Full-Linear Bandwidth
MHz
6
Full-Power Bandwidth
dB
76
IMD
Intermodulation Distortion
dB
70
SFDR
Spurious-Free Dynamic Range
LSB
0.5
INL
Relative Accuracy (Note 2)
Bits
10
Resolution
dB
-70
THD
Total Harmonic Distortion
dB
60
SINAD
Signal-to-Noise Plus Distortion
Ratio
ppm/C
0.8
Gain-Error Temperature
Coefficient
1.0
LSB
1.0
DNL
Differential Nonlinearity
LSB
4.0
Offset Error
LSB
3.0
Gain Error (Note 3)
UNITS
MIN
TYP
MAX
SYMBOL
PARAMETER
pF
18
Input Capacitance
V
0
2.5
V
AIN
Input Voltage Range
DC ACCURACY (Note 1)
DYNAMIC SPECIFICATIONS (100kHz sine wave, 2.5Vp-p, clock = 6.4MHz)
CONVERSION RATE
ANALOG INPUT (AIN)
MAX1084/MAX1085
400ksps/300ksps, Single-Supply, Low-Power,
Serial 10-Bit ADCs with Internal Reference
_______________________________________________________________________________________
3
ELECTRICAL CHARACTERISTICS--MAX1084 (continued)
(V
DD
= +4.5V to +5.5V, f
SCLK
= 6.4MHz, 50% duty cycle, 16 clocks/conversion cycle (400ksps), 4.7F capacitor at REF, T
A
= T
MIN
to
T
MAX
, unless otherwise noted. Typical values are at T
A
= +25C.)
CONDITIONS
UNITS
MIN
TYP
MAX
SYMBOL
PARAMETER
CS = 5V
CS = 5V
I
SOURCE
= 1mA
I
SINK
= 5mA
V
IN
= 0 or V
DD
0 to 1.0mA output load
T
A
= +25C
V
4.5
5.5
V
DD
Positive Supply Voltage (Note 6)
pF
15
C
OUT
Three-State Output Capacitance
A
10
I
L
Three-State Leakage Current
V
4
V
OH
Output Voltage High
V
0.4
V
OL
Output Voltage Low
pF
15
C
IN
Input Capacitance
A
1
I
IN
Input Leakage
V
0.2
V
HYST
Input Hysteresis
V
0.8
V
INL
Input Low Voltage
V
3.0
V
INH
Input High Voltage
F
4.7
10
Capacitive Bypass at REF
mV/mA
0.1
2.0
Load Regulation (Note 5)
V
2.48
2.50
2.52
V
REF
REF Output Voltage
mA
30
REF Short-Circuit Current
ppm/C
15
TC V
REF
REF Output Tempco
V
DD
= 5V 10%, midscale input
SCLK = V
DD
, SHDN = GND
V
DD
= 5.5V
mV
0.5
2.0
PSR
Power-Supply Rejection
A
2
10
I
SHDN
Shutdown Supply Current
mA
2.5
4.0
I
DD
Positive Supply Current (Note 7)
ELECTRICAL CHARACTERISTICS--MAX1085
(V
DD
= +2.7V to +3.6V, f
SCLK
= 4.8MHz, 50% duty cycle, 16 clocks/conversion cycle (300ksps), 4.7F capacitor at REF, T
A
= T
MIN
to
T
MAX
, unless otherwise noted. Typical values are at T
A
= +25C.)
MAX1085A
MAX1085B
No missing codes over temperature
CONDITIONS
LSB
0.5
INL
Relative Accuracy (Note 2)
Bits
10
Resolution
ppm/C
1.6
Gain-Error Temperature
Coefficient
LSB
3.0
Gain Error (Note 3)
1.0
LSB
1.0
DNL
Differential Nonlinearity
LSB
3.0
Offset Error
UNITS
MIN
TYP
MAX
SYMBOL
PARAMETER
DC ACCURACY (Note 1)
INTERNAL REFERENCE
DIGITAL INPUTS (SCLK, CS, SHDN)
DIGITAL OUTPUT (DOUT)
POWER SUPPLY
MAX1084/MAX1085
400ksps/300ksps, Single-Supply, Low-Power,
Serial 10-Bit ADCs with Internal Reference
4
_______________________________________________________________________________________
ELECTRICAL CHARACTERISTICS--MAX1085 (continued)
(V
DD
= +2.7V to +3.6V, f
SCLK
= 4.8MHz, 50% duty cycle, 16 clocks/conversion cycle (300ksps), 4.7F capacitor at REF, T
A
= T
MIN
to
T
MAX
, unless otherwise noted. Typical values are at T
A
= +25C.)
SINAD > 58dB
-3dB point
f
IN1
= 99kHz, f
IN2
=102kHz
Up to the 5th harmonic
CONDITIONS
ps
<50
Aperture Jitter
ns
10
Aperture Delay
ns
625
t
ACQ
Track/Hold Acquisition Time
s
3.3
t
CONV
Conversion Time (Note 4)
kHz
250
Full-Linear Bandwidth
MHz
3
Full-Power Bandwidth
dB
76
IMD
Intermodulation Distortion
dB
70
SFDR
Spurious-Free Dynamic Range
dB
-70
THD
Total Harmonic Distortion
dB
60
SINAD
Signal-to-Noise Plus Distortion
Ratio
UNITS
MIN
TYP
MAX
SYMBOL
PARAMETER
I
SINK
= 5mA
V
IN
= 0 or V
DD
T
A
= +25C
0 to 0.75mA output load
V
0.4
V
OL
Output Voltage Low
pF
15
C
IN
Input Capacitance
A
1
I
IN
Input Leakage
V
0.2
V
HYST
Input Hysteresis
V
0.8
V
INL
Input Low Voltage
V
2.0
V
INH
Input High Voltage
F
4.7
10
Capacitive Bypass at REF
mV/mA
0.1
2.0
Load Regulation (Note 5)
ppm/C
15
TC V
REF
REF Output Tempco
%
40
60
MHz
0.5
4.8
f
SCLK
Serial Clock Frequency
Duty Cycle
mA
15
REF Short Circuit Current
V
2.48 2.50
2.52
V
REF
REF Output Voltage
V
0
2.5
V
AIN
Input Voltage Range
pF
18
C
IN
Input Capacitance
CS = 3V
CS = 3V
I
SOURCE
= 0.5mA
pF
15
C
OUT
Three-State Output Capacitance
A
10
I
L
Three-State Leakage Current
V
V
DD
- 0.5V
V
OH
Output Voltage High
V
2.7
3.6
V
DD
Positive Supply Voltage (Note 6)
V
DD
= 3.6V
mA
2.5
3.5
I
DD
Positive Supply Current (Note 7)
SCLK = V
DD
, SHDN = GND
A
2
10
I
SHDN
Shutdown Supply Current
V
DD
= 2.7V to 3.6V, midscale input
mV
0.5
2.0
PSR
Power-Supply Rejection
DYNAMIC SPECIFICATIONS (75kHz sinewave, 2.5Vp-p, f
SAMPLE
= 300ksps, f
SCLK
= 4.8MHz)
CONVERSION RATE
INTERNAL REFERENCE
DIGITAL INPUTS (SCLK,CS, SHDN)
DIGITAL OUTPUTS (DOUT)
ANALOG INPUT
POWER SUPPLY
MAX1084/MAX1085
400ksps/300ksps, Single-Supply, Low-Power,
Serial 10-Bit ADCs with Internal Reference
_______________________________________________________________________________________
5
TIMING CHARACTERISTICS--MAX1084
(Figures 1, 2, 8, 9; V
DD
= +4.5V to +5.5V, T
A
= T
MIN
to T
MAX
, unless otherwise noted.)
TIMING CHARACTERISTICS--MAX1085
(Figures 1, 2, 8, 9; V
DD
= +2.7V to +3.6V, T
A
= T
MIN
to T
MAX
, unless otherwise noted.)
C
LOAD
= 20pF
C
LOAD
= 20pF
C
LOAD
= 20pF
C
LOAD
= 20pF
CONDITIONS
ns
100
t
CSW
CS Pulse Width High
ns
62
t
CL
SCLK Pulse Width Low
ns
62
t
CH
ns
156
t
CP
SCLK Period
SCLK Pulse Width High
ns
65
t
DOE
CS Fall to DOUT Enable
ns
10
65
t
DOD
CS Rise to DOUT Disable
ns
80
t
DOV
SCLK Rise to DOUT Valid
ns
10
t
DOH
SCLK Rise to DOUT Hold
ns
35
t
CSS
CS Fall to SCLK Rise Setup
ns
0
t
CSH
SCLK Rise to CS Rise Hold
ns
35
t
CSO
SCLK Rise to CS Fall Ignore
ns
35
t
CS1
CS Rise to SCLK Rise Ignore
UNITS
MIN
TYP
MAX
SYMBOL
PARAMETER
C
LOAD
= 20pF
C
LOAD
= 20pF
C
LOAD
= 20pF
CONDITIONS
ns
83
t
CL
SCLK Pulse Width Low
ns
83
t
CH
ns
208
t
CP
SCLK Period
SCLK Pulse Width High
ns
13
85
t
DOD
CS Rise to DOUT Disable
ns
100
t
DOV
SCLK Rise to DOUT Valid
ns
13
t
DOH
SCLK Rise to DOUT Hold
ns
45
t
CSS
CS Fall to SCLK Rise Setup
ns
0
t
CSH
SCLK Rise to CS Rise Hold
ns
45
t
CSO
SCLK Rise to CS Fall Ignore
ns
45
t
CS1
CS Rise to SCLK Rise Ignore
UNITS
MIN
TYP
MAX
SYMBOL
PARAMETER
Note 1: Tested at V
DD
= V
DD,MIN
.
Note 2: Relative accuracy is the deviation of the analog value at any code from its theoretical value after the full-scale range has
been calibrated.
Note 3: Internal reference, offset, and reference errors nulled.
Note 4: Conversion time is defined as the number of clock cycles multiplied by the clock period; clock has 50% duty cycle.
Note 5: External load should not change during conversion for specified accuracy. Guaranteed specification limit of 2mV/mA due to
production test limitation.
Note 6: Electrical characteristics are guaranteed from V
DD,MIN
to V
DD,MAX
. For operations beyond this range, see Typical Operating
Characteristics.
Note 7: MAX1084 tested with 20pF on DOUT and f
SCLK
= 6.4MHz, 0 to 5V. MAX1085 tested with same loads, f
SCLK
= 4.8MHz, 0 to
3V. DOUT = full scale.
C
LOAD
= 20pF
ns
85
t
DOE
CS Fall to DOUT Enable
C
LOAD
= 20pF
ns
100
t
CSW
CS Pulse Width High
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