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MAX1279BETC+

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18
General Description
The MAX1277/MAX1279 are low-power, high-speed, seri-
al-output, 12-bit, analog-to-digital converters (ADCs) with
an internal reference that operates at up to 1.5Msps.
These devices feature true-differential inputs, offering bet-
ter noise immunity, distortion improvements, and a wider
dynamic range over single-ended inputs. A standard
SPI™/QSPI™/MICROWIRE™ interface provides the clock
necessary for conversion. These devices easily interface
with standard digital signal processor (DSP) synchronous
serial interfaces.
The MAX1277/MAX1279 operate from a single +2.7V to
+3.6V supply voltage. The MAX1277/MAX1279 include a
2.048V internal reference. The MAX1277 has a unipolar
analog input, while the MAX1279 has a bipolar analog
input. These devices feature a partial power-down mode
and a full power-down mode for use between conver-
sions, which lower the supply current to 2mA (typ) and
1µA (max), respectively. Also featured is a separate
power-supply input (V
L
), which allows direct interfacing to
+1.8V to V
DD
digital logic. The fast conversion speed,
low-power dissipation, excellent AC performance, and DC
accuracy (±1 LSB INL) make the MAX1277/MAX1279
ideal for industrial process control, motor control, and
base-station applications.
The MAX1277/MAX1279 come in a 12-pin TQFN pack-
age, and are available in the extended (-40°C to +85°C)
temperature range.
Applications
Data Acquisition Communications
Bill Validation Portable Instruments
Motor Control
Features
o 1.5Msps Sampling Rate
o Only 22mW (typ) Power Dissipation
o Only 1µA (max) Shutdown Current
o High-Speed, SPI-Compatible, 3-Wire Serial Interface
o 68.5dB S/(N + D) at 525kHz Input Frequency
o Internal True-Differential Track/Hold (T/H)
o Internal 2.048V Reference
o No Pipeline Delays
o Small 12-Pin TQFN Package
MAX1277/MAX1279
1.5Msps, Single-Supply, Low-Power, True-
Differential, 12-Bit ADCs with Internal Reference
________________________________________________________________
Maxim Integrated Products
1
12
AIN+
11
N.C.
10
SCLK
45
N.C.
6
GND
1
2REF
3
9
8
7RGND
CNVST
DOUT
V
L
MAX1277
MAX1279
AIN-
V
DD
TQFN
TOP VIEW
PART
TEMP RANGE
PIN-
PACKAGE
INPUT
MAX1277AETC-T
-40°C to +85°C
12 TQFN
Unipolar
MAX1277BETC-T
-40°C to +85°C
12 TQFN
Unipolar
MAX1279AETC-T
-40°C to +85°C
12 TQFN
Bipolar
MAX1279BETC-T
-40°C to +85°C
12 TQFN
Bipolar
Pin Configuration
Ordering Information
MAX1277
MAX1279
DOUT
AIN+
4.7μF
10μF10μF
+2.7V TO +3.6V
0.01μF
0.01μF
0.01μF
+1.8V TO V
DD
AIN-
REF
V
DD
DIFFERENTIAL
INPUT
VOLTAGE
RGND
V
L
GND
CNVST
SCLK
μC/DSP
+
-
Typical Operating Circuit
19-3365; Rev 1; 4/09
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.
SPI/QSPI are trademarks of Motorola, Inc.
MICROWIRE is a trademark of National Semiconductor Corp.
MAX1277/MAX1279
1.5Msps, Single-Supply, Low-Power, True-
Differential, 12-Bit ADCs with Internal Reference
2 _______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS
(V
DD
= +2.7V to +3.6V, V
L
= V
DD
, f
SCLK
= 24MHz, 50% duty cycle, T
A
= -40°C to +85°C, unless otherwise noted. Typical values are
at T
A
= +25°C.)
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
V
L
to GND ................-0.3V to the lower of (V
DD
+ 0.3V) and +6V
Digital Inputs
to GND .................-0.3V to the lower of (V
DD
+ 0.3V) and +6V
Digital Output
to GND....................-0.3V to the lower of (V
L
+ 0.3V) and +6V
Analog Inputs and
REF to GND..........-0.3V to the lower of (V
DD
+ 0.3V) and +6V
RGND to GND .......................................................-0.3V to +0.3V
Maximum Current into Any Pin............................................50mA
Continuous Power Dissipation (T
A
= +70°C)
12-Pin TQFN (derate 16.9mW/°C above +70°C) ......1349mW
Operating Temperature Range
MAX127_ _ ETC..............................................-40°C to +85°C
Junction Temperature......................................................+150°C
Storage Temperature Range .............................-60°C to +150°C
Lead Temperature (soldering, 10s) .................................+300°C
PARAMETER
SYMBOL
CONDITIONS
MIN TYP MAX
DC ACCURACY
Resolution 12 Bits
MAX127_A
-1.0 +1.0
Relative Accuracy (Note 1) INL
MAX127_B
-1.5 +1.5
LSB
MAX127_A
-1.0 +1.0
Differential Nonlinearity (Note 2) DNL
MAX127_B
-1.0 +1.5
LSB
Offset Error
±8.0
LSB
Offset-Error Temperature
Coefficient
±1
Gain Error Offset nulled
±6.0
LSB
Gain Temperature Coefficient ±2
DYNAMIC SPECIFICATIONS (f
IN
= 525kHz sine wave, V
IN
= V
REF
, unless otherwise noted.)
Signal-to-Noise Plus Distortion
SINAD 66
68.5
dB
Total Harmonic Distortion THD Up to the 5th harmonic -80 -76 dB
Spurious-Free Dynamic Range SFDR -83 -76 dB
Intermodulation Distortion IMD
f
IN1
= 250kHz, f
IN2
= 300kHz
-78 dB
Full-Power Bandwidth -3dB point, small-signal method 15
Full-Linear Bandwidth S/(N + D) > 68dB, single ended 1.2
CONVERSION RATE
Minimum Conversion Time t
CONV
(Note 3)
0.667
µs
Maximum Throughput Rate 1.5
M i ni m um Thr oug hp ut Rate ( N ote 4) 10
Track-and-Hold Acquisition Time
t
ACQ
(Note 5) 125 ns
Aperture Delay 5ns
Aperture Jitter (Note 6) 30 ps
External Clock Frequency f
SCLK
(Note 7) 24
MAX1277/MAX1279
1.5Msps, Single-Supply, Low-Power, True-
Differential, 12-Bit ADCs with Internal Reference
_______________________________________________________________________________________ 3
ELECTRICAL CHARACTERISTICS (continued)
(V
DD
= +2.7V to +3.6V, V
L
= V
DD
, f
SCLK
= 24MHz, 50% duty cycle, T
A
= -40°C to +85°C, unless otherwise noted. Typical values are
at T
A
= +25°C.)
PARAMETER
SYMBOL
CONDITIONS
MIN TYP MAX UNITS
ANALOG INPUTS (AIN+, AIN-)
AIN+ - AIN-, MAX1277 0
V
REF
Differential Input Voltage Range
V
IN
AIN+ - AIN-, MAX1279
-V
REF
/ 2 +V
REF
/ 2
V
Absolute Input Voltage Range 0
V
DD
V
DC Leakage Current ±1 µA
Input Capacitance Per input pin 16 pF
Input Current (Average)
Time averaged at maximum throughput rate
75 µA
REFERENCE OUTPUT (REF)
REF Output Voltage Range Static, T
A
= +25°C
2.038 2.048 2.058
V
Voltage Temperature Coefficient
±50 ppm/°C
I
SOURCE
= 0 to 2mA
0.35
Load Regulation
I
SINK
= 0 to 100µA 1.0
mV/mA
Line Regulation V
DD
= 2.7V to 3.6V, static
0.25 mV/V
DIGITAL INPUTS (SCLK, CNVST)
Input Voltage Low VIL
0.3 x V
L
V
Input Voltage High VIH 0.7 x V
L
V
Input Leakage Current I
IL
0.05 ±10
µA
DIGITAL OUTPUT (DOUT)
Output Load Capacitance C
OUT
For stated timing performance 30 pF
Output Voltage Low V
OL
I
SINK
= 5mA, V
L
≥ 1.8V 0.4 V
Output Voltage High V
OH
I
SOURCE
= 1mA, V
L
≤ 1.8V
V
L
- 0.5V
V
Output Leakage Current I
OL
Output high impedance
±0.2 ±10
µA
POWER REQUIREMENTS
Analog Supply Voltage V
DD
2.7 3.6 V
Digital Supply Voltage V
L
1.8
V
DD
V
Static, f
SCLK
= 24MHz 6 8
Static, no SCLK 5 7
Analog Supply Current,
Normal Mode
I
DD
Operational, 1.5Msps 7 9
mA
f
SCLK
= 24MHz 2
Analog Supply Current,
Partial Power-Down Mode
I
DD
No SCLK 2
mA
f
SCLK
= 24MHz 1
Analog Supply Current,
Full Power-Down Mode
I
DD
No SCLK 0.3 1
µA
Operational, full-scale input at 1.5Msps 0.3 1
Static, f
SCLK
= 24MHz
0.15
0.5
Partial/full power-down mode,
f
SCLK
= 24MHz
0.1 0.3
mA
Digital Supply Current (Note 8)
Static, no SCLK, all modes 0.1 1 µA
Positive-Supply Rejection PSR V
DD
= 3V +20% -10%, full-scale input
±0.2 ±3.0
mV
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18

MAX1279BETC+

Mfr. #:
Buy MAX1279BETC+
Manufacturer:
Maxim Integrated
Description:
Analog to Digital Converters - ADC 12-Bit 1.5Msps 3.6V Precision ADC
Lifecycle:
New from this manufacturer.
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