19-1388; Rev 0; 11/98
+2.7V, Low-Power, 2-Channel, 108ksps, Serial 10-Bit ADCs in 8-Pin µMAX
General Description
The MAX157/MAX159 low-power, 10-bit analog-to-digi- tal converters (ADCs) are available in 8-pin µMAX and DIP packages. Both devices operate with a single +2.7V to +5.25V supply and feature a 7.4µs succes- sive-approximation ADC, automatic power-down, fast wake-up (2.5µs), an on-chip clock, and a high-speed, 3-wire serial interface.
Power consumption is only 3.2mW (VDD = +3.6V) at the maximum sampling rate of 108ksps. At slower throughput rates, the 0.2µA automatic shutdown further reduces power consumption.
The MAX157 provides 2-channel, single-ended operation and accepts input signals from 0 to VREF. The MAX159 accepts pseudo-differential inputs ranging from 0 to VREF. An external clock accesses data through the 3-wire serial interface, which is SPI™, QSPI™, and MICROWIRE™ compatible.
Excellent dynamic performance and low power, combined with ease of use and a small package size, make these converters ideal for battery-powered and data acquisition applications, or for other circuits with demanding power-consumption and space requirements. For pin-compatible 12-bit upgrades, see the MAX144/MAX145 data sheet.
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Applications |
Battery-Powered Systems |
Instrumentation |
Portable Data Logging |
Test Equipment |
Isolated Data Acquisition |
Medical Instruments |
Process-Control Monitoring |
System Supervision |
Pin Configuration
TOP VIEW
VDD |
1 |
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8 |
SCLK |
CH0 (CH+) |
2 |
MAX157 |
7 |
DOUT |
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CH1 (CH-) |
3 |
MAX159 |
6 |
CS/SHDN |
GND |
4 |
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5 |
REF |
μMAX/DIP
( ) ARE FOR MAX159 ONLY.
SPI and QSPI are trademarks of Motorola, Inc.
MICROWIRE is a trademark of National Semiconductor Corp.
Features
♦Single-Supply Operation (+2.7V to +5.25V)
♦Two Single-Ended Channels (MAX157) Single Pseudo-Differential Channel (MAX159)
♦Low Power
0.9mA (at 108ksps, +3V) 100µA (at 10ksps, +3V) 10µA (at 1ksps, +3V) <0.2µA (power-down mode)
♦Internal Track/Hold
♦108ksps Sampling Rate
♦SPI/QSPI/MICROWIRE-Compatible 3-Wire Serial Interface
♦Space-Saving 8-Pin µMAX Package
♦Pin-Compatible 12-Bit Upgrades Available
Ordering Information
PART |
TEMP. |
PIN- |
INL |
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RANGE |
PACKAGE |
(LSB) |
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MAX157ACUA |
0°C to +70°C |
8 |
µMAX |
±0.5 |
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MAX157BCUA |
0°C to +70°C |
8 |
µMAX |
±1 |
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MAX157ACPA |
0°C to +70°C |
8 |
Plastic DIP |
±0.5 |
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MAX157BCPA |
0°C to +70°C |
8 |
Plastic DIP |
±1 |
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MAX157AEUA |
-40°C to +85°C |
8 |
µMAX |
±0.5 |
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MAX157BEUA |
-40°C to +85°C |
8 |
µMAX |
±1 |
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MAX157AEPA |
-40°C to +85°C |
8 |
Plastic DIP |
±0.5 |
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MAX157BEPA |
-40°C to +85°C |
8 |
Plastic DIP |
±1 |
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MAX157AMJA |
-55°C to +125°C |
8 CERDIP* |
±0.5 |
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MAX157BMJA |
-55°C to +125°C |
8 CERDIP* |
±1 |
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MAX159ACUA |
0°C to +70°C |
8 |
µMAX |
±0.5 |
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MAX159BCUA |
0°C to +70°C |
8 |
µMAX |
±1 |
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MAX159ACPA |
0°C to +70°C |
8 |
Plastic DIP |
±0.5 |
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MAX159BCPA |
0°C to +70°C |
8 |
Plastic DIP |
±1 |
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MAX159AEUA |
-40°C to +85°C |
8 |
µMAX |
±0.5 |
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MAX159BEUA |
-40°C to +85°C |
8 |
µMAX |
±1 |
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MAX159AEPA |
-40°C to +85°C |
8 |
Plastic DIP |
±0.5 |
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MAX159BEPA |
-40°C to +85°C |
8 |
Plastic DIP |
±1 |
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MAX159AMJA |
-55°C to +125°C |
8 CERDIP* |
±0.5 |
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MAX159BMJA |
-55°C to +125°C |
8 CERDIP* |
±1 |
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*Contact factory for availability.
________________________________________________________________ Maxim Integrated Products 1
MAX157/MAX159
For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800. For small orders, phone 1-800-835-8769.
MAX157/MAX159
+2.7V, Low-Power, 2-Channel,
108ksps, Serial 10-Bit ADCs in 8-Pin µMAX
ABSOLUTE MAXIMUM RATINGS
VDD to GND.............................................................. |
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- 0.3V to +6V |
Operating Temperature Ranges |
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CH0, CH1 (CH+, CH-) to GND................... |
-0.3V to (VDD + 0.3V) |
MAX157/MAX159_C_A ....................................... |
0°C to +70°C |
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REF to GND................................................ |
-0.3V to (VDD + 0.3V) |
MAX157/MAX159_E_A .................................... |
-40°C to +85°C |
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Digital Inputs to GND ............................................... |
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- 0.3V to +6V |
MAX157/MAX159_MJA................................. |
-55°C to +125°C |
DOUT to GND............................................. |
-0.3V to (VDD + 0.3V) |
Storage Temperature Range ............................. |
-60°C to +150°C |
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DOUT Sink Current ............................................................ |
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25mA |
Lead Temperature (soldering, 10sec) ............................. |
+300°C |
Continuous Power Dissipation (TA = +70°C) |
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µMAX (derate 4.1mW/°C above +70°C) ...................... |
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330mW |
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Plastic DIP (derate 9.09mW/°C above +70°C) |
............727mW |
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CERDIP (derate 8.00mW/°C above +70°C)................. |
640mW |
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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.
ELECTRICAL CHARACTERISTICS
(VDD = +2.7V to +5.25V, VREF = 2.5V, 0.1µF capacitor at REF, fSCLK = 2.17MHz, 16 clocks/conversion cycle (108ksps), CH- = GND for MAX159, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.)
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PARAMETER |
SYMBOL |
CONDITIONS |
MIN |
TYP |
MAX |
UNITS |
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DC ACCURACY (Note 1) |
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Resolution |
RES |
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10 |
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Bits |
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Relative Accuracy (Note 2) |
INL |
MAX15_A |
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±0.5 |
LSB |
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MAX15_B |
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±1 |
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Differential Nonlinearity |
DNL |
No missing codes over temperature |
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±0.5 |
LSB |
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Offset Error |
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±2 |
LSB |
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Gain Error (Note 3) |
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±2 |
LSB |
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Gain Temperature Coefficient |
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External reference, VREF = 2.5V |
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±0.8 |
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ppm/°C |
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Channel-to-Channel Offset |
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±0.02 |
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LSB |
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Matching |
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Channel-to-Channel Gain |
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±0.02 |
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LSB |
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Matching |
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DYNAMIC SPECIFICATIONS (fIN (sine wave) = 10kHz, VIN = 2.5Vp-p, 108ksps, external fSCLK = 2.17MHz, CH- = GND for MAX159)
Signal-to-Noise Ratio plus |
SINAD |
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66 |
dB |
Distortion |
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Total Harmonic Distortion |
THD |
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-70 |
dB |
(including 5th-order harmonic) |
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Spurious-Free Dynamic Range |
SFDR |
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70 |
dB |
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Channel-to-Channel Crosstalk |
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fIN = 65kHz, VIN = 2.5Vp-p (Note 4) |
-75 |
dB |
Small-Signal Bandwidth |
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-3dB rolloff |
2.25 |
MHz |
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Full-Power Bandwidth |
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1.0 |
MHz |
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2 _______________________________________________________________________________________
+2.7V, Low-Power, 2-Channel, 108ksps, Serial 10-Bit ADCs in 8-Pin µMAX
ELECTRICAL CHARACTERISTICS (continued)
(VDD = +2.7V to +5.25V, VREF = 2.5V, 0.1µF capacitor at REF, fSCLK = 2.17MHz, 16 clocks/conversion cycle (108ksps), CH- = GND for MAX159, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.)
PARAMETER |
SYMBOL |
CONDITIONS |
MIN |
TYP |
MAX |
UNITS |
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CONVERSION RATE |
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External clock, fSCLK = 2.17MHz, 16 clock |
7.4 |
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Conversion Time (Note 5) |
tCONV |
cycles per conversion |
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µs |
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Internal clock |
5 |
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7 |
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T/H Acquisition Time |
tACQ |
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2.5 |
µs |
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Aperture Delay |
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25 |
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ns |
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Aperture Jitter |
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<50 |
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ps |
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External clock mode |
0.1 |
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2.17 |
MHz |
Serial Clock Frequency |
fSCLK |
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MHz |
Internal clock mode, for data transfer only |
0 |
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5 |
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ANALOG INPUTS |
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Analog Input Voltage Range |
VIN |
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0 |
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VREF |
V |
(Note 6) |
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Multiplexer Leakage Current |
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On/off-leakage current, VIN = 0 to VDD |
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±0.01 |
±1 |
µA |
Input Capacitance |
CIN |
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16 |
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µA |
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EXTERNAL REFERENCE |
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Input Voltage Range (Note 7) |
VREF |
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0 |
VDD + 50mV |
V |
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Input Current |
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VREF = 2.5V |
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100 |
140 |
µA |
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Input Resistance |
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18 |
25 |
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kΩ |
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Shutdown REF Input Current |
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0.01 |
10 |
µA |
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DIGITAL INPUTS (CS/SHDN, SCLK) AND |
DIGITAL OUTPUT (DOUT) |
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Input High Voltage |
VIH |
VDD ≤ 3.6V |
2.0 |
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V |
VDD > 3.6V |
3.0 |
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Input Low Voltage |
VIL |
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0.8 |
V |
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Input Hysteresis |
VHYS |
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0.2 |
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V |
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Input Leakage Current |
IIN |
VIN = 0 or VDD |
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±1 |
µA |
Input Capacitance |
CIN |
(Note 8) |
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15 |
pF |
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Output Low Voltage |
VOL |
ISINK = 5mA |
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0.4 |
V |
ISINK = 16mA |
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0.5 |
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Output High Voltage |
VOH |
ISOURCE = 0.5mA |
VDD - 0.5 |
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V |
Three-State Output Leakage |
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CS/SHDN = VDD |
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±10 |
µA |
Current |
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Three-State Output Capacitance |
COUT |
CS/SHDN = VDD (Note 8) |
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15 |
pF |
MAX157/MAX159
_______________________________________________________________________________________ 3
MAX157/MAX159
+2.7V, Low-Power, 2-Channel,
108ksps, Serial 10-Bit ADCs in 8-Pin µMAX
ELECTRICAL CHARACTERISTICS (continued)
(VDD = +2.7V to +5.25V, VREF = 2.5V, 0.1µF capacitor at REF, fSCLK = 2.17MHz, 16 clocks/conversion cycle (108ksps), CH- = GND for MAX159, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.)
PARAMETER |
SYMBOL |
CONDITIONS |
MIN |
TYP |
MAX |
UNITS |
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POWER REQUIREMENTS |
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Positive Supply Voltage |
VDD |
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+2.7 |
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+5.25 |
V |
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Positive Supply Current |
IDD |
Operating mode |
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0.9 |
2.0 |
mA |
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Positive Supply Current |
IDD |
Shutdown, CS/SHDN = GND |
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0.2 |
5 |
µA |
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Power-Supply Rejection |
PSR |
VDD = 2.7V to 5.25V, full-scale input |
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±0.15 |
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mV |
(Note 9) |
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TIMING CHARACTERISTICS (Figure 7)
(VDD = +2.7V to +5.25V, VREF = 2.5V, 0.1µF capacitor at REF, fSCLK = 2.17MHz, 16 clocks/conversion cycle (108ksps), CH- = GND for MAX159, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.)
PARAMETER |
SYMBOL |
CONDITIONS |
MIN |
TYP |
MAX |
UNITS |
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Wake-Up Time |
tWAKE |
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2.5 |
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µs |
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CS/SHDN Fall to Output Enable |
tDV |
CL = 100pF (Figure 1) |
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120 |
ns |
CS/SHDN Rise to Output |
tTR |
CL = 100pF (Figure 1) |
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120 |
ns |
Disable |
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SCLK Fall to Output Data Valid |
tDO |
CL = 100pF |
20 |
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120 |
ns |
SCLK Clock Frequency |
fSCLK |
External clock |
0.1 |
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2.17 |
MHz |
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Internal clock, SCLK for data transfer only |
0 |
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5 |
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External clock |
215 |
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SCLK Pulse Width High |
tCH |
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ns |
Internal clock, SCLK for data transfer only |
50 |
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(Note 8) |
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External clock |
215 |
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SCLK Pulse Width Low |
tCL |
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ns |
Internal clock, SCLK for data transfer only |
50 |
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(Note 8) |
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SCLK to CS/SHDN Setup |
tSCLKS |
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60 |
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ns |
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CS/SHDN Pulse Width |
tCS |
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60 |
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ns |
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Note 1: Tested at VDD = +2.7V.
Note 2: Relative accuracy is the deviation of the analog value at any code from its theoretical value after full-scale range has been calibrated.
Note 3: Offset nulled.
Note 4: The on channel is grounded; the sine wave is applied to off channel (MAX157 only).
Note 5: Conversion time is defined as the number of clock cycles times the clock period; clock has 50% duty cycle. Note 6: The common-mode range for the analog inputs is from GND to VDD (MAX159 only).
Note 7: ADC performance is limited by the converter’s noise floor, typically 300µVp-p. Note 8: Guaranteed by design. Not subject to production testing.
Note 9: Measured as VFS(2.7V) - VFS(5.25V).
4 _______________________________________________________________________________________
+2.7V, Low-Power, 2-Channel, 108ksps, Serial 10-Bit ADCs in 8-Pin µMAX
Typical Operating Characteristics
(VDD = +3.0V, VREF = 2.5V, 0.1µF capacitor at REF, fSCLK = 2.17MHz, 16 clocks/conversion cycle (108ksps); CH- = GND for MAX159; TA = +25°C, unless otherwise noted.)
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SUPPLY CURRENT |
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SUPPLY CURRENT |
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SUPPLY CURRENT |
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vs. SUPPLY VOLTAGE |
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vs. TEMPERATURE |
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vs. SAMPLING RATE |
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1500 |
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toc01 |
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1500 |
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toc02 |
10,000 |
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toc03 |
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VREF |
= VDD |
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V |
REF = |
VDD |
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V |
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REF |
= VDD |
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A)(μ |
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MAX157/159 |
A)(μ |
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MAX157/159 |
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A)(μ |
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MAX157/159 |
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RL = |
∞ |
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R |
L = ∞ |
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CODE |
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= |
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1010101000 |
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1300 |
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1000 |
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CL = |
50pF |
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CL = |
50pF |
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1250 |
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C |
L = 50pF |
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CURRENT |
1100 |
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CODE |
= 1010101000 |
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CURRENT |
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CODE = 1010101000 |
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CURRENT |
100 |
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1000 |
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||||||||||
SUPPLY |
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SUPPLY |
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SUPPLY |
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900 |
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10 |
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750 |
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|||||
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700 |
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1 |
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500 |
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500 |
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0.1 |
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2.5 |
3.0 3.5 |
4.0 |
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4.5 |
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5.0 |
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5.5 |
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-60 |
-40 -20 |
0 20 40 60 80 |
100 120 |
140 |
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0.1 |
1 |
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10 |
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100 |
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1k 10k 100k |
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VDD (V) |
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TEMPERATURE (°C) |
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SAMPLING RATE (sps) |
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SHUTDOWN CURRENT |
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SHUTDOWN CURRENT |
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vs. SUPPLY VOLTAGE |
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vs. TEMPERATURE |
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1000 |
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toc04 |
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1000 |
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toc05 |
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VREF = |
VDD |
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VREF = VDD |
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|||||||||||
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MAX157/159 |
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MAX157/159 |
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(nA) |
800 |
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(nA) |
800 |
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CURRENT |
600 |
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CURRENT |
600 |
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|||
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SHUTDOWN |
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SHUTDOWN |
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|||||
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400 |
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400 |
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|||||
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|||
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200 |
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200 |
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|||
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0 |
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0 |
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2.5 |
3.0 |
3.5 |
4.0 |
4.5 |
5.0 |
5.5 |
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-60 |
-40 |
-20 0 |
20 |
40 |
60 80 |
100 |
120 |
140 |
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|||||||||||||||||||||||||||||||||||
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VDD (V) |
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|
TEMPERATURE (°C) |
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||||||||||||||||
|
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|
OFFSET ERROR vs. SUPPLY VOLTAGE |
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|
OFFSET ERROR vs. TEMPERATURE |
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|||||||||||||||||||||||||||||||||||||||||||||
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0.20 |
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MAX157/159 toc06 |
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0.20 |
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MAX157/159 toc07 |
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|||
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|||||||
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0.15 |
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|
ERROR (LSB) |
0.15 |
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||||||
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ERROR (LSB) |
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||||||
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0.10 |
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0.10 |
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|||||
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|||||||
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OFFSET |
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OFFSET |
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||
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0.05 |
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0.05 |
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|||
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0 |
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0 |
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|||
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2.5 |
3.0 |
3.5 |
4.0 |
4.5 |
5.0 |
|
5.5 |
|
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|
|
|
|
-60 |
-35 |
-10 |
|
15 |
|
40 |
65 |
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90 |
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|
115 |
|
140 |
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||||||||||||||||||||||||||
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VDD (V) |
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|
TEMPERATURE (°C) |
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|
MAX157/MAX159
_______________________________________________________________________________________ 5