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MAX1249BEEE+

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24
_______________
General Description
The MAX1248/MAX1249 10-bit data-acquisition sys-
tems combine a 4-channel multiplexer, high-bandwidth
track/hold, and serial interface with high conversion
speed and low power consumption. They operate from
a single +2.7V to +5.25V supply, and their 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
MAX1248/MAX1249 use either the internal clock or an
external serial-interface clock to perform successive-
approximation analog-to-digital conversions.
The MAX1248 has an internal 2.5V reference, while the
MAX1249 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 pro-
grammed to automatically shut down at the end of a
conversion. Accessing the serial interface automatically
powers up the MAX1248/MAX1249, 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 MAX1248/MAX1249 are available in a 16-pin DIP
and a very small QSOP that occupies the same board
area as an 8-pin SO.
For 8-channel versions of these devices, see the
MAX148/MAX149 data sheet.
________________________Applications
Portable Data Logging Data Acquisition
Medical Instruments Battery-Powered Instruments
Pen Digitizers System Supervision
____________________________Features
♦ 4-Channel Single-Ended or 2-Channel
Differential Inputs
♦ Single +2.7V to +5.25V Operation
♦ Internal 2.5V Reference (MAX1248)
♦ 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)
MAX1248/MAX1249
+2.7V to +5.25V, Low-Power, 4-Channel,
Serial 10-Bit ADCs in QSOP-16
________________________________________________________________
Maxim Integrated Products
1
19-1072; Rev 2; 5/98
PART
†
MAX1248ACPE
MAX1248BCPE
MAX1248ACEE 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
_____________
Ordering Information
Ordering Information continued at end of data sheet.
†
Contact factory for availability of alternate surface-mount
packages.
Pin Configuration appears at end of data sheet.
MAX1248BCEE 0°C to +70°C 16 QSOP
INL
(LSB)
±1/2
±1
±1/2
±1
SPI and QSPI are trademarks of Motorola, Inc.
MICROWIRE is a trademark of National Semiconductor Corp.
V
DD
I/O
SCK (SK)
MOSI (SO)
MISO (SI)
V
SS
SHDN
SSTRB
DOUT
DIN
SCLK
CS
COM
AGND
DGND
V
DD
CH3
C1
4.7µF
C2
0.01µF
C3
0.1µF
CH0
0V TO
+2.5V
ANALOG
INPUTS
MAX1248
CPU
+3V
VREF
REFADJ
__________Typical Operating Circuit
For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800.
For small orders, phone 408-737-7600 ext. 3468.
MAX1248/MAX1249
+2.7V to +5.25V, Low-Power, 4-Channel,
Serial 10-Bit ADCs in QSOP-16
2 _______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS
(V
DD
= +2.7V to +5.25V; COM = 0V; f
SCLK
= 2.0MHz; external clock (50% duty cycle); 15 clocks/conversion cycle (133ksps);
MAX1248—4.7µF capacitor at VREF pin; MAX1249—external reference, VREF = 2.500V 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 8.30mW/°C above +70°C)................... 667mW
CERDIP (derate 10.00mW/°C above +70°C).............. 800mW
Operating Temperature Ranges
MAX1248_C_E/MAX1249_C_E.......................... 0°C to +70°C
MAX1248_E_E/MAX1249_E_E........................ -40°C to +85°C
MAX1248_MJE/MAX1249_MJE.................... -55°C to +125°C
Storage Temperature Range............................ -60°C to +150°C
Lead Temperature (soldering, 10sec)............................ +300°C
6
µs
35 65
t
CONV
Conversion Time (Note 5)
5.5 7.5
MHz1.0Full-Power Bandwidth
MHz2.25Small-Signal Bandwidth
dB-75Channel-to-Channel Crosstalk
dB70SFDRSpurious-Free Dynamic Range
dB-70THDTotal Harmonic Distortion
dB66SINADSignal-to-Noise + Distortion Ratio
LSB±0.05
Channel-to-Channel Offset
Matching
ppm/°C±0.25Gain Temperature Coefficient
±0.5
Bits10Resolution
±1
Offset Error
LSB
±1.0
INLRelative Accuracy (Note 2)
LSB±1DNL
±1
LSB
±2
UNITSMIN TYP MAXSYMBOLPARAMETER
External clock = 2MHz, 12 clocks/conversion
Internal clock, SHDN = V
DD
Internal clock, SHDN = FLOAT
MAX124_A
-3dB rolloff
65kHz, 2.500Vp-p (Note 4)
Up to the 5th harmonic
MAX124_A
MAX124_B
No missing codes over temperature
MAX124_A
MAX124_B
CONDITIONS
Differential Nonlinearity
ns30Aperture Delay
MHz
1.8
SHDN = FLOAT
ps<50Aperture Jitter
MHz
0.1 2.0
µs1.5t
ACQ
Track/Hold Acquisition Time
0.225
Internal Clock Frequency
SHDN = V
DD
0 2.0
External Clock Frequency
Data transfer only
LSBGain Error (Note 3)
±2MAX124_B
DC ACCURACY (Note 1)
DYNAMIC SPECIFICATIONS (10kHz sine-wave input, 0V to 2.500Vp-p, 133ksps, 2.0MHz external clock, bipolar input mode)
CONVERSION RATE
MAX1248/MAX1249
+2.7V to +5.25V, Low-Power, 4-Channel,
Serial 10-Bit ADCs in QSOP-16
_______________________________________________________________________________________ 3
Multiplexer Leakage Current
pF15C
IN
DIN, SCLK, CS Input Capacitance
µA±0.01 ±1I
IN
DIN, SCLK, CS Input Leakage
V0.2V
HYST
DIN, SCLK, CS Input Hysteresis
V0.8V
IL
DIN, SCLK, CS Input Low Voltage
2.0
µA0.01 10Shutdown VREF Input Current
kΩ18 25VREF Input Resistance
µA100 150VREF Input Current
V
1.0
V
DD
+
50mV
VREF Input Voltage Range
(Note 9)
pF16Input Capacitance
0 to VREF
V
±VREF / 2
Input Voltage Range, Single-
Ended and Differential (Note 6)
µA±0.01 ±1
UNITSMIN TYP MAXSYMBOLPARAMETER
(Note 10)
V
IN
= 0V or V
DD
Unipolar, COM = 0V
V
DD
≤ 3.6V
VREF = 2.500V
Bipolar, COM = VREF / 2
On/off leakage current, V
CH_
= 0V or V
DD
CONDITIONS
µA±4.0I
S
SHDN Input Current
V0.4V
SL
SHDN Input Low Voltage
VV
DD
- 0.4V
SH
SHDN Input High Voltage
SHDN = 0V or V
DD
ELECTRICAL CHARACTERISTICS (continued)
(V
DD
= +2.7V to +5.25V; COM = 0V; f
SCLK
= 2.0MHz; external clock (50% duty cycle); 15 clocks/conversion cycle (133ksps);
MAX1248—4.7µF capacitor at VREF pin; MAX1249—external reference, VREF = 2.500V applied to VREF pin; T
A
= T
MIN
to T
MAX
,
unless otherwise noted.)
V
3.0
V
IH
DIN, SCLK, CS Input High Voltage
V
DD
> 3.6V
V2.470 2.500 2.530VREF Output Voltage T
A
= +25°C (Note 7)
mA30VREF Short-Circuit Current
ppm/°C±30VREF Temperature Coefficient MAX1248
µF
0
Capacitive Bypass at VREF
Internal compensation mode
4.7External compensation mode
mV0.35Load Regulation (Note 8) 0mA to 0.2mA output load
µF0.01Capacitive Bypass at REFADJ
±1.5REFADJ Adjustment Range %
V
V
DD -
0.5
REFADJ Buffer-Disable Threshold
Capacitive Bypass at VREF
Internal compensation mode 0
µF
External compensation mode 4.7
Reference-Buffer Gain
MAX1248 2.06
V/V
MAX1249 2.00
REFADJ Input Current
MAX1248 ±50
µA
MAX1249 ±10
V1.1 V
DD
- 1.1V
SM
SHDN Input Mid Voltage
ANALOG/COM INPUTS
EXTERNAL REFERENCE AT VREF (Buffer disabled)
DIGITAL INPUTS (DIN, SCLK, CS, SHDN)
EXTERNAL REFERENCE AT REFADJ
INTERNAL REFERENCE (MAX1248 only, reference buffer enabled)
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24

MAX1249BEEE+

Mfr. #:
Buy MAX1249BEEE+
Manufacturer:
Maxim Integrated
Description:
Analog to Digital Converters - ADC 10-Bit 4Ch 133ksps 5.25V Precision ADC
Lifecycle:
New from this manufacturer.
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