MAX1274BCTC-T

Manufacturer Part NumberMAX1274BCTC-T
DescriptionAnalog to Digital Converters - ADC
ManufacturerMaxim Integrated
MAX1274BCTC-T datasheet
 


Specifications of MAX1274BCTC-T

Number Of Channels1ArchitectureSAR
Conversion Rate1800 KSPsResolution12 bit
Input TypeDifferentialSnr70 dB
Interface TypeQSPI, Serial (SPI, Microwire)Operating Supply Voltage4.75 V to 5.25 V
Maximum Operating Temperature+ 70 CPackage / CaseTQFN EP
Maximum Power Dissipation1349 mWMinimum Operating Temperature0 C
Number Of Converters1Voltage Reference5.25 V
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19-3158; Rev 1; 4/09
1.8Msps, Single-Supply, Low-Power,
General Description
The MAX1274/MAX1275 low-power, high-speed, serial-
output, 12-bit, analog-to-digital converters (ADCs) oper-
ate at up to 1.8Msps. These devices feature true-differen-
tial inputs, offering better 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 MAX1274/MAX1275 operate from a single +4.75V to
+5.25V supply voltage and require an external reference.
The MAX1274 has a unipolar analog input, while the
MAX1275 has a bipolar analog input. These devices fea-
ture a partial power-down mode and a full power-down
mode for use between conversions, which lower the sup-
ply current to 1mA (typ) and 1µA (max), respectively. Also
featured is a separate power-supply input (V
allows direct interfacing to +1.8V to V
fast conversion speed, low-power dissipation, excellent
AC performance, and DC accuracy (±1 LSB INL) make
the MAX1274/MAX1275 ideal for industrial process con-
trol, motor control, and base-station applications.
The MAX1274/MAX1275 come in a 12-pin TQFN pack-
age, and are available in the extended (-40°C to +85°C)
temperature range.
Data Acquisition
Communications
Bill Validation
Portable Instruments
Motor Control
Pin Configuration
TOP VIEW
AIN+
N.C.
SCLK
12
11
10
AIN-
1
REF
2
MAX1274
MAX1275
RGND
3
4
5
6
V
N.C.
GND
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.
True-Differential, 12-Bit ADCs
♦ 1.8Msps Sampling Rate
♦ Only 45mW (typ) Power Dissipation
♦ Only 1µA (max) Shutdown Current
♦ High-Speed, SPI-Compatible, 3-Wire Serial Interface
♦ 70dB S/(N + D) at 525kHz Input Frequency
♦ Internal True-Differential Track/Hold (T/H)
♦ External Reference
♦ No Pipeline Delays
♦ Small 12-Pin TQFN Package
), which
L
digital logic. The
DD
PART
MAX1274AETC+T
MAX1274BETC+T
Applications
MAX1275AETC+T
MAX1275BETC+T
+ Denotes a lead(Pb)-free/RoHS-compliant package.
T = Tape and reel.
+4.75V TO +5.25V
10μF
9
CNVST
DIFFERENTIAL
8
DOUT
VOLTAGE
7
V
L
REF
4.7μF
Features
Ordering Information
PIN-
TEMP RANGE
PACKAGE
-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
Typical Operating Circuit
+1.8V TO V
DD
0.01μF
0.01μF
V
V
DD
L
+
DOUT
AIN+
INPUT
-
AIN-
MAX1274
MAX1275
CNVST
SCLK
REF
RGND
GND
0.01μF
INPUT
Unipolar
Unipolar
Bipolar
Bipolar
10μF
μC/DSP
1

MAX1274BCTC-T Summary of contents

  • Page 1

    ... GND 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. True-Differential, 12-Bit ADCs ♦ 1.8Msps Sampling Rate ♦ ...

  • Page 2

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

  • Page 3

    Single-Supply, Low-Power, ELECTRICAL CHARACTERISTICS (continued +5V ±5 4.096V REF values are +25°C.) A PARAMETER SYMBOL ANALOG INPUTS (AIN+, AIN-) Differential Input Voltage Range Absolute ...

  • Page 4

    Single-Supply, Low-Power, True-Differential, 12-Bit ADCs TIMING CHARACTERISTICS (V = +5V ±5 4.096V REF values are +25°C.) A PARAMETER SYMBOL SCLK Pulse-Width High SCLK Pulse-Width Low SCLK ...

  • Page 5

    Single-Supply, Low-Power +5V 4.096V REF +25°C) A INTEGRAL NONLINEARITY vs. DIGITAL OUTPUT CODE (MAX1274) 0.8 0.6 0.4 0.2 0 -0.2 -0.4 -0.6 -0.8 0 ...

  • Page 6

    Single-Supply, Low-Power, True-Differential, 12-Bit ADCs (V = +5V 4.096V REF +25°C) A FFT PLOT (MAX1275) 0 -20 -40 -60 -80 -100 -120 -140 0 200 ANALOG ...

  • Page 7

    Single-Supply, Low-Power +5V 4.096V REF +25°C) A TWO-TONE IMD PLOT (MAX1274) 0 -20 f IN1 -40 -60 -80 -100 -120 -140 0 200 ANALOG ...

  • Page 8

    Single-Supply, Low-Power, True-Differential, 12-Bit ADCs (V = +5V 4.096V REF +25° SUPPLY CURRENT L vs. TEMPERATURE 1.0 0.8 0.6 0.4 0.2 0 -40 -15 ...

  • Page 9

    Single-Supply, Low-Power REF AIN+ 12-BIT T/H SAR ADC AIN- CONTROL LOGIC AND TIMING MAX1274 MAX1275 RGND Figure 3. Functional Diagram Detailed Description The MAX1274/MAX1275 use an input T/H and succes- sive-approximation register (SAR) circuitry to convert an ...

  • Page 10

    Single-Supply, Low-Power, True-Differential, 12-Bit ADCs Serial Interface Initialization After Power-Up and Starting a Conversion Upon initial power-up, the MAX1274/MAX1275 require a complete conversion cycle to initialize the internal cali- bration. Following this initial conversion, the part is ready for ...

  • Page 11

    Single-Supply, Low-Power, Partial Power-Down and Full Power-Down Modes Power consumption can be reduced significantly by plac- ing the MAX1274/MAX1275 in either partial power-down mode or full power-down mode. Partial power-down mode is ideal for infrequent data sampling and fast ...

  • Page 12

    Single-Supply, Low-Power, True-Differential, 12-Bit ADCs 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 (MAX1274 Only) OUTPUT CODE V REF FS = 011...111 2 ...

  • Page 13

    Single-Supply, Low-Power, 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 MAX1274/MAX1275 ______________________________________________________________________________________ True-Differential, 12-Bit ADCs D11 D10 ...

  • Page 14

    Single-Supply, Low-Power, True-Differential, 12-Bit ADCs 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 13. SPI/MICROWIRE Serial-Interface Timing—Continuous ...

  • Page 15

    Single-Supply, Low-Power, The SPC register should be written as follows: TXM = 0, external frame sync MCM = 0, CLKX is taken from the CLKX pin FSM = 1, burst mode data transmitted/received as 16-bit words ...

  • Page 16

    Single-Supply, Low-Power, True-Differential, 12-Bit ADCs CNVST SCLK 1 DOUT D11 Figure 18. DSP Interface—Single-Conversion, Continuous/Burst Clock V L MAX1274 SCLK MAX1275 CNVST DOUT Figure 19. Interfacing to the ADSP21_ _ _ SUPPLIES GND 10μF 10μF 0.1μF ...

  • Page 17

    Single-Supply, Low-Power, Signal-to-Noise Ratio For a waveform perfectly reconstructed from digital sam- ples, signal-to-noise ratio (SNR) is the ratio of the full- scale analog input (RMS value) to the RMS quantization error (residual error). The theoretical minimum analog-to- digital ...

  • 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 ...