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MAX1247BCEE

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24P25-P25
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.
General Description
The MAX1246/MAX1247 12-bit data-acquisition systems
combine a 4-channel multiplexer, high-bandwidth
track/hold, and serial interface with high conversion
speed and low power consumption. The MAX1246 oper-
ates from a single +2.7V to +3.6V supply; the MAX1247
operates from a single +2.7V to +5.25V supply. Both
devices’ analog inputs are software configurable for
unipolar/bipolar and single-ended/differential operation.
The 4-wire serial interface connects directly to SPI™/
QSPI™ and MICROWIRE™ devices without external
logic. A serial strobe output allows direct connection to
TMS320-family digital signal processors. The MAX1246/
MAX1247 use either the internal clock or an external seri-
al-interface clock to perform successive-approximation
analog-to-digital conversions.
The MAX1246 has an internal 2.5V reference, while the
MAX1247 requires an external reference. Both parts have
a reference-buffer amplifier with a ±1.5% voltage-
adjustment range. These devices provide a hard-wired
SHDN pin and a software-selectable power-down, and
can be programmed to automatically shut down at the
end of a conversion. Accessing the serial interface auto-
matically powers up the MAX1246/MAX1247, and the
quick turn-on time allows them to be shut down between
all conversions. This technique can cut supply current to
under 60µA at reduced sampling rates. The MAX1246/
MAX1247 are available in a 16-pin DIP and a small QSOP
that occupies the same board area as an 8-pin SO.
For 8-channel versions of these devices, see the
MAX146/MAX147 data sheet.
________________________Applications
Portable Data Logging
Medical Instruments
Pen Digitizers
Data Acquisition
Battery-Powered Instruments
Process Control
Features
♦ 4-Channel Single-Ended or 2-Channel
Differential Inputs
♦ Single-Supply Operation:
+2.7V to +3.6V (MAX1246)
+2.7V to +5.25V (MAX1247)
♦ Internal 2.5V Reference (MAX1246)
♦ Low Power: 1.2mA (133ksps, 3V supply)
54µA (1ksps, 3V supply)
1µA (power-down mode)
♦ SPI/QSPI/MICROWIRE/TMS320-Compatible
4-Wire Serial Interface
♦ Software-Configurable Unipolar or Bipolar Inputs
♦ 16-Pin QSOP Package (same area as 8-pin SO)
MAX1246/MAX1247
+2.7V, Low-Power, 4-Channel,
Serial 12-Bit ADCs in QSOP-16
________________________________________________________________ Maxim Integrated Products 1
V
DD
I/O
SCK (SK)
MOSI (SO)
MISO (SI)
V
SS
SHDN
SSTRB
DOUT
DIN
SCLK
CS
COM
AGND
DGND
V
DD
CH3
4.7µF
0.1µF
CH0
0V TO
+2.5V
ANALOG
INPUTS
MAX1246
CPU
+3V
VREF
0.047µF
REFADJ
__________Typical Operating Circuit
19-1071; Rev 2; 10/01
PART
MAX1246ACPE
MAX1246BCPE
MAX1246ACEE 0°C to +70°C
0°C to +70°C
0°C to +70°C
TEMP RANGE PIN-PACKAGE
16 Plastic DIP
16 Plastic DIP
16 QSOP
EVALUATION KIT
AVAILABLE
Ordering Information
Ordering Information continued at end of data sheet.
MAX1246BCEE 0°C to +70°C 16 QSOP
INL
(LSB)
±1/2
±1
±1/2
±1
SPI and QSPI are registered trademarks of Motorola, Inc.
MICROWIRE is a registered trademark of National
Semiconductor Corp.
Pin Configuration appears at end of data sheet.
MAX1246/MAX1247
+2.7V, Low-Power, 4-Channel,
Serial 12-Bit ADCs in QSOP-16
2 _______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS
(V
DD
= +2.7V to +3.6V (MAX1246); V
DD
= +2.7V to +5.25V (MAX1247); COM = 0V; f
SCLK
= 2.0MHz; external clock (50% duty cycle);
15 clocks/conversion cycle (133ksps); MAX1246—4.7µF capacitor at VREF pin; MAX1247—external reference, VREF = 2.5V applied
to VREF pin; T
A
= T
MIN
to T
MAX
; unless otherwise noted.)
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 AGND, DGND................................................. -0.3V to 6V
AGND to DGND ...................................................... -0.3V to 0.3V
CH0–CH3, COM to AGND, DGND ............ -0.3V to (V
DD
+ 0.3V)
VREF to AGND........................................... -0.3V to (V
DD
+ 0.3V)
Digital Inputs to DGND .............................................. -0.3V to 6V
Digital Outputs to DGND ........................... -0.3V to (V
DD
+ 0.3V)
Digital Output Sink Current .................................................25mA
Continuous Power Dissipation (T
A
= +70°C)
Plastic DIP (derate 10.53mW/°C above +70°C) ......... 842mW
QSOP (derate 8.36mW/°C above +70°C)................... 667mW
CERDIP (derate 10.00mW/°C above +70°C).............. 800mW
Operating Temperature Ranges
MAX1246_C_E/MAX1247_C_E .......................... 0°C to +70°C
MAX1246_E_E/MAX1247_E_E........................ -40°C to +85°C
MAX1246_MJE/MAX1247_MJE .................... -55°C to +125°C
Storage Temperature Range ............................ -60°C to +150°C
Lead Temperature (soldering, 10s) ................................ +300°C
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
DC ACCURACY (Note 1)
Resolution 12 Bits
MAX124_A
±0.5
MAX124_B
±1.0
Relative Accuracy (Note 2) INL
MAX1247C
±2.0
LSB
No Missing Codes NMC 12 Bits
MAX124_A/MAX124_B ±1
Differential Nonlinearity DNL
MAX124_C
±0.8
LSB
MAX124_A
±0.5
±3
Offset Error
MAX124_B
±0.5
±4
LSB
Gain Error (Note 3)
±0.5
±4 LSB
Gain Temperature Coefficient
±0.25
ppm/°C
Channel-to-Channel Offset
Matching
±0.25
LSB
DYNAMIC SPECIFICATIONS (10kHz sine-wave input, 0V to 2.500Vp-p, 133ksps, 2.0MHz external clock, bipolar input mode)
MAX124_A/MAX124_B 70 73
Signal-to-Noise + Distortion
Ratio
SINAD
MAX1247C 73
dB
MAX124_A/MAX124_B -88 -80
Total Harmonic Distortion THD
Up to the 5th
harmonic
MAX1247C -88
dB
MAX124_A/MAX124_B 80 90
Spurious-Free Dynamic Range SFDR
MAX1247C 90
dB
Channel-to-Channel Crosstalk 65kHz, 2.500V
P-P
(Note 4) -85 dB
Small-Signal Bandwidth -3dB rolloff
2.25
MHz
Full-Power Bandwidth 1.0 MHz
MAX1246/MAX1247
+2.7V, Low-Power, 4-Channel,
Serial 12-Bit ADCs in QSOP-16
_______________________________________________________________________________________ 3
ELECTRICAL CHARACTERISTICS (continued)
(V
DD
= +2.7V to +3.6V (MAX1246); V
DD
= +2.7V to +5.25V (MAX1247); COM = 0V; f
SCLK
= 2.0MHz; external clock (50% duty cycle);
15 clocks/conversion cycle (133ksps); MAX1246—4.7µF capacitor at VREF pin; MAX1247—external reference, VREF = 2.5V applied
to VREF pin; T
A
= T
MIN
to T
MAX
; unless otherwise noted.)
SYMBOL
MIN
TYP
MAX
UNITS
<50
0.225
0 to VREF
±VREF / 2
±0.01
2.480 2.500 2.520
±30 ±50
±30 ±60
±30 ±80
ppm/°C
±0.35
0.047
±1.5
VDD +
50mV
100 150
0.01 100
VDD -
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24P25-P25

MAX1247BCEE

Mfr. #:
Buy MAX1247BCEE
Manufacturer:
Maxim Integrated
Description:
Analog to Digital Converters - ADC +2.7V, Low-Power, 4-Channel, Serial 12-Bit ADCs in QSOP-16
Lifecycle:
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