MAX1279BCTC-T Maxim Integrated, MAX1279BCTC-T Datasheet

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MAX1279BCTC-T

Manufacturer Part Number
MAX1279BCTC-T
Description
Analog to Digital Converters - ADC
Manufacturer
Maxim Integrated
Datasheet

Specifications of MAX1279BCTC-T

Number Of Channels
1
Architecture
SAR
Conversion Rate
1.5 MSPs
Resolution
12 bit
Input Type
Differential
Snr
68.5 dB
Interface Type
Serial (3-Wire)
Operating Supply Voltage
2.7 V to 3.6 V
Maximum Operating Temperature
+ 70 C
Package / Case
TQFN EP
Maximum Power Dissipation
1349 mW
Minimum Operating Temperature
0 C
Number Of Converters
1
Voltage Reference
2.048 V
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
+1.8V to V
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.
19-3365; Rev 1; 4/09
SPI/QSPI are trademarks of Motorola, Inc.
MICROWIRE is a trademark of National Semiconductor Corp.
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.
Differential, 12-Bit ADCs with Internal Reference
TOP VIEW
Data Acquisition
Bill Validation
Motor Control
DD
RGND
AIN-
REF
digital logic. The fast conversion speed,
1
2
3
________________________________________________________________ Maxim Integrated Products
1.5Msps, Single-Supply, Low-Power, True-
L
V
AIN+
), which allows direct interfacing to
12
4
DD
General Description
MAX1277
MAX1279
TQFN
N.C.
N.C.
11
5
Pin Configuration
Communications
Portable Instruments
SCLK
GND
10
6
Applications
9
8
7
CNVST
DOUT
V
L
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
MAX1277AETC-T
MAX1277BETC-T
MAX1279AETC-T
MAX1279BETC-T
+2.7V TO +3.6V
4.7μF
DIFFERENTIAL
10μF
PART
VOLTAGE
INPUT
0.01μF
+
-
Typical Operating Circuit
0.01μF
TEMP RANGE
-40°C to +85°C 12 TQFN
-40°C to +85°C 12 TQFN
-40°C to +85°C 12 TQFN
-40°C to +85°C 12 TQFN
AIN+
REF
AIN-
RGND
Ordering Information
V
DD
MAX1277
MAX1279
+1.8V TO V
GND
V
CNVST
L
PIN-
PACKAGE
0.01μF
DOUT
SCLK
DD
Features
10μF
Unipolar
Unipolar
μC/DSP
Bipolar
Bipolar
INPUT
1

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MAX1279BCTC-T Summary of contents

Page 1

... DD TQFN SPI/QSPI are trademarks of Motorola, Inc. MICROWIRE is a trademark of National Semiconductor Corp. ________________________________________________________________ Maxim Integrated Products 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. o 1.5Msps Sampling Rate o Only 22mW (typ) Power Dissipation o Only 1µ ...

Page 2

Single-Supply, Low-Power, True- Differential, 12-Bit ADCs with Internal Reference ABSOLUTE MAXIMUM RATINGS V to GND ..............................................................-0. GND ................-0.3V to the lower Digital Inputs to GND .................-0.3V to the lower of (V ...

Page 3

Single-Supply, Low-Power, True- Differential, 12-Bit ADCs with Internal Reference ELECTRICAL CHARACTERISTICS (continued +2.7V to +3.6V SCLK +25°C.) A PARAMETER SYMBOL ANALOG INPUTS (AIN+, AIN-) Differential Input ...

Page 4

Single-Supply, Low-Power, True- Differential, 12-Bit ADCs with Internal Reference TIMING CHARACTERISTICS (V = +2.7V to +3.6V SCLK +25°C.) A PARAMETER SYMBOL SCLK Pulse-Width High SCLK Pulse-Width Low SCLK ...

Page 5

Single-Supply, Low-Power, True- Differential, 12-Bit ADCs with Internal Reference (V = +3V 24MHz SCLK sured +25°C.) A MAXIMUM RECOMMENDED f vs. V SCLK ...

Page 6

Single-Supply, Low-Power, True- Differential, 12-Bit ADCs with Internal Reference (V = +3V 24MHz SCLK sured +25°C.) A DYNAMIC PERFORMANCE vs. INPUT FREQUENCY (MAX1277) 70.0 69.5 69.0 ...

Page 7

Single-Supply, Low-Power, True- Differential, 12-Bit ADCs with Internal Reference (V = +3V 24MHz SCLK sured +25°C.) A TOTAL HARMONIC DISTORTION vs. SOURCE IMPEDANCE -50 -60 f ...

Page 8

Single-Supply, Low-Power, True- Differential, 12-Bit ADCs with Internal Reference (V = +3V 24MHz SCLK sured +25°C SUPPLY CURRENT DD vs. CONVERSION RATE 8 6 ...

Page 9

Single-Supply, Low-Power, True- Differential, 12-Bit ADCs with Internal Reference PIN NAME 1 AIN- Negative Analog Input Reference Voltage Output. Internal 2.048V reference output. Bypass REF with a 0.01µF capacitor and 2 REF a 4.7µF capacitor to RGND. 3 RGND ...

Page 10

Single-Supply, Low-Power, True- Differential, 12-Bit ADCs with Internal Reference True-Differential Analog Input T/H The equivalent circuit of Figure 4 shows the input archi- tecture of the MAX1277/MAX1279, which is composed of a T/H, a comparator, and a switched-capacitor digi- ...

Page 11

Single-Supply, Low-Power, True- Differential, 12-Bit ADCs with Internal Reference Timing and Control Conversion-start and data-read operations are con- trolled by the CNVST and SCLK digital inputs. Figures 1 and 5 show timing diagrams, which outline the serial- interface operation. ...

Page 12

Single-Supply, Low-Power, True- Differential, 12-Bit ADCs with Internal Reference OUTPUT CODE FULL-SCALE 111...111 TRANSITION 111...110 111...101 000...011 000...010 000...001 000...000 DIFFERENTIAL INPUT VOLTAGE (LSB) Figure 8. Unipolar Transfer Function (MAX1277 Only) OUTPUT CODE V REF ...

Page 13

Single-Supply, Low-Power, True- Differential, 12-Bit ADCs with Internal Reference CNVST SCLK 1 DOUT Figure 10. Continuous Conversion with Burst/Continuous Clock A) SPI B) QSPI C) MICROWIRE Figure 11. Common Serial-Interface Connections to the MAX1277/MAX1279 ______________________________________________________________________________________ D11 ...

Page 14

Single-Supply, Low-Power, True- Differential, 12-Bit ADCs with Internal Reference CNVST 1 SCLK HIGH-Z DOUT D11 Figure 12. SPI/MICROWIRE Serial-Interface Timing—Single Conversion (CPOL = CPHA = 0), (CPOL = CPHA = 1) CNVST SCLK DOUT Figure ...

Page 15

Single-Supply, Low-Power, True- Differential, 12-Bit ADCs with Internal Reference read the data without CPU intervention. Connect the V pin to the TMS320C54_ supply voltage when the MAX1277/MAX1279 are operating with an analog sup- ply voltage higher than the DSP ...

Page 16

Single-Supply, Low-Power, True- Differential, 12-Bit ADCs with Internal Reference CNVST SCLK 1 DOUT D11 Figure 18. DSP Interface—Single-Conversion, Continuous/Burst Clock V L MAX1277 SCLK MAX1279 CNVST DOUT Figure 19. Interfacing to the ADSP21_ _ _ SUPPLIES ...

Page 17

Single-Supply, Low-Power, True- Differential, 12-Bit ADCs with Internal Reference Differential Nonlinearity Differential nonlinearity (DNL) is the difference between an actual step width and the ideal value of 1 LSB. A DNL error specification of 1 LSB or less guarantees ...

Page 18

... Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time. 18 ____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 © 2009 Maxim Integrated Products ...

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