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PDF MAX1085 Data sheet ( Hoja de datos )
| Número de pieza | MAX1085 | |
| Descripción | Serial 10-Bit ADCs | |
| Fabricantes | Maxim Integrated | |
| Logotipo |  |
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19-1686; Rev 1; 12/10
400ksps/300ksps, Single-Supply, Low-Power,
Serial 10-Bit ADCs with Internal Reference
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
SPI™/QSPI™/MICROWIRE™ 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
Pin Configuration
Features
♦ Single-Supply Operation
+4.5V to +5.5V (MAX1084)
+2.7V to +3.6V (MAX1085)
♦ 10-Bit Resolution
♦ 400ksps Sampling Rate (MAX1084)
♦ Internal Track/Hold
♦ Internal +2.5V Reference
♦ Low Power: 2.5mA (400ksps)
♦ SPI/QSPI/MICROWIRE 3-Wire Serial Interface
♦ Pin-Compatible, High-Speed Upgrade to
MAX1242/MAX1243
♦ 8-Pin SO Package
Ordering Information
PART
TEMP
RANGE
PIN-
PACKAGE
MAX1084ACSA+ 0°C to +70°C 8 SO
MAX1084BCSA+ 0°C to +70°C 8 SO
MAX1084AESA+ -40°C to +85°C 8 SO
MAX1084BESA+ -40°C to +85°C 8 SO
MAX1085ACSA+ 0°C to +70°C 8 SO
MAX1085BCSA+ 0°C to +70°C 8 SO
MAX1085AESA+ -40°C to +85°C 8 SO
MAX1085BESA+ -40°C to +85°C 8 SO
+Denotes a lead(Pb)-free/RoHS-compliant package.
INL
(LSB)
±1/2
±1
±1/2
±1
±1/2
±1
±1/2
±1
Functional Diagram
TOP VIEW
+
VDD 1
AIN 2
SHDN 3
REF 4
MAX1084
MAX1085
8 SCLK
7 CS
6 DOUT
5 GND
SO
SPI and QSPI are trademarks of Motorola, Inc.
MICROWIRE is a trademark of National Semiconductor Corp.
CS
SCLK
7
8
SHDN 3
AIN 2
4
REF
VDD
1
CONTROL
LOGIC
T/H
2.5V
REFERENCE
INT
CLOCK
10-BIT
SAR
OUTPUT
SHIFT
REGISTER
6 DOUT
MAX1084
MAX1085
5
GND
________________________________________________________________ Maxim Integrated Products 1
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.
1 page  
400ksps/300ksps, Single-Supply, Low-Power,
Serial 10-Bit ADCs with Internal Reference
TIMING CHARACTERISTICS—MAX1084
(Figures 1, 2, 8, 9; VDD = +4.5V to +5.5V, TA = TMIN to TMAX, unless otherwise noted.)
PARAMETER
SYMBOL
CONDITIONS
SCLK Period
SCLK Pulse-Width High
tCP
tCH
SCLK Pulse-Width Low
CS Fall to SCLK Rise Setup
SCLK Rise to CS Rise Hold
SCLK Rise to CS Fall Ignore
CS Rise to SCLK Rise Ignore
SCLK Rise to DOUT Hold
tCL
tCSS
tCSH
tCSO
tCS1
tDOH
CLOAD = 20pF
SCLK Rise to DOUT Valid
CS Rise to DOUT Disable
CS Fall to DOUT Enable
CS Pulse-Width High
tDOV
tDOD
tDOE
tCSW
CLOAD = 20pF
CLOAD = 20pF
CLOAD = 20pF
MIN TYP MAX UNITS
156 ns
62 ns
62 ns
35 ns
0 ns
35 ns
35 ns
10 ns
80 ns
10 65 ns
65 ns
100 ns
TIMING CHARACTERISTICS—MAX1085
(Figures 1, 2, 8, 9; VDD = +2.7V to +3.6V, TA = TMIN to TMAX, unless otherwise noted.)
PARAMETER
SYMBOL
CONDITIONS
SCLK Period
tCP
SCLK Pulse-Width High
tCH
SCLK Pulse-Width Low
CS Fall to SCLK Rise Setup
SCLK Rise to CS Rise Hold
SCLK Rise to CS Fall Ignore
CS Rise to SCLK Rise Ignore
tCL
tCSS
tCSH
tCSO
tCS1
SCLK Rise to DOUT Hold
tDOH CLOAD = 20pF
SCLK Rise to DOUT Valid
CS Rise to DOUT Disable
CS Fall to DOUT Enable
CS Pulse-Width High
tDOV
tDOD
tDOE
tCSW
CLOAD = 20pF
CLOAD = 20pF
CLOAD = 20pF
CLOAD = 20pF
MIN TYP MAX UNITS
208 ns
83 ns
83 ns
45 ns
0 ns
45 ns
45 ns
13 ns
100 ns
13 85 ns
85 ns
100 ns
Note 1: Tested at VDD = VDD,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 VDD,MIN to VDD,MAX. For operations beyond this range, see Typical Operating
Characteristics.
Note 7: MAX1084 tested with 20pF on DOUT and fSCLK = 6.4MHz, 0 to 5V. MAX1085 tested with same loads, fSCLK = 4.8MHz, 0 to
3V. DOUT = full scale.
_______________________________________________________________________________________ 5
5 Page 
400ksps/300ksps, Single-Supply, Low-Power,
Serial 10-Bit ADCs with Internal Reference
10,000
1000
100
SUPPLY CURRENT
vs. CONVERSION RATE
VDD = 3.0V
DOUT = FS
RL = ∞
CL = 10pF
10
1
0.1
0.1
1 10 100 1k 10k 100k
CONVERSION RATE (SAMPLES)
Figure 6. Supply Current vs. Conversion Rate
1.50
CREF = 4.7µF
1.25
1.00
0.75
0.50
0.25
0
0.0001
0.001 0.01 0.1
1
TIME IN SHUTDOWN (s)
10
Figure 7. Reference Power-Up vs. Time in Shutdown
CS
SCLK
HIGH-Z
DOUT
1
ACQ
A/D STATE
34
8 12 15
D9 D8 D7 D6 D5 D4 D3 D2 D1 D0 S1 S0
HIGH-Z
HOLD/CONVERT
ACQUISITION
Figure 8. Interface Timing Sequence
CS
SCLK
ttCCSSOO
tCSS
tCL tCH
tCP
DOUT
tDOH
tDOE tDOV
tCSW
tCSH tCSI
tDOD
Figure 9. Detailed Serial-Interface Timing
______________________________________________________________________________________ 11
11 Page | ||
| Páginas | Total 16 Páginas | |
| PDF Descargar | [ Datasheet MAX1085.PDF ] | |
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