MAX1224CTC-T Maxim Integrated, MAX1224CTC-T Datasheet

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MAX1224CTC-T

Manufacturer Part Number
MAX1224CTC-T
Description
Analog to Digital Converters - ADC
Manufacturer
Maxim Integrated
Datasheet

Specifications of MAX1224CTC-T

Number Of Channels
1
Architecture
SAR
Conversion Rate
1.5 MSPs
Resolution
12 bit
Input Type
Differential
Snr
No
Interface Type
3-Wire, Microwire, QSPI, Serial, SPI
Operating Supply Voltage
3 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
External
The MAX1224/MAX1225 low-power, high-speed, serial-
output, 12-bit, analog-to-digital converters (ADCs) oper-
ate at up to 1.5Msps. 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 MAX1224/MAX1225 operate from a single +2.7V to
+3.6V supply voltage and require an external reference.
The MAX1224 has a unipolar analog input, while the
MAX1225 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, good AC
performance, and DC accuracy (±1.5 LSB INL) make the
MAX1224/MAX1225 ideal for industrial process control,
motor control, and base-station applications.
The MAX1224/MAX1225 come in a 12-pin TQFN pack-
age, and are available in the extended (-40°C to +85°C)
temperature range.
19-3271; 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.
TOP VIEW
Data Acquisition
Bill Validation
Motor Control
RGND
AIN-
REF
1
2
3
________________________________________________________________ Maxim Integrated Products
V
AIN+
12
4
DD
General Description
MAX1224
MAX1225
TQFN
N.C.
Pin Configuration
N.C.
11
5
1.5Msps, Single-Supply, Low-Power,
Communications
Portable Instruments
SCLK
GND
10
6
Applications
DD
digital logic. The
9
8
7
CNVST
DOUT
V
L
True-Differential, 12-Bit ADCs
L
), which
♦ 1.5Msps Sampling Rate
♦ Only 18mW (typ) Power Dissipation
♦ Only 1µA (max) Shutdown Current
♦ High-Speed, SPI-Compatible, 3-Wire Serial Interface
♦ 69dB S/(N + D) at 525kHz Input Frequency
♦ Internal True-Differential Track/Hold (T/H)
♦ External Reference
♦ No Pipeline Delays
♦ Small 12-Pin TQFN Package
+ Denotes a lead(Pb)-free/RoHS-compliant package.
T = Tape and reel.
MAX1224ETC+T
MAX1225ETC+T
+2.7V TO +3.6V
REF
4.7μF
DIFFERENTIAL
10μF
PART
VOLTAGE
INPUT
0.01μF
+
-
Typical Operating Circuit
0.01μF
-40°C to +85°C 12 TQFN
-40°C to +85°C 12 TQFN
TEMP RANGE
AIN+
AIN-
REF
RGND
V
Ordering Information
DD
MAX1224
MAX1225
+1.8V TO V
GND
V
CNVST
L
0.01μF
DOUT
SCLK
PIN-
PACKAGE
DD
Features
10μF
μC/DSP
Unipolar
Bipolar
INPUT
1

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MAX1224CTC-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 ♦ 1.5Msps 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 +2.7V to +3.6V REF Typical values are and T = +25°C PARAMETER SYMBOL ANALOG INPUTS (AIN+, AIN-) Differential ...

Page 4

Single-Supply, Low-Power, True-Differential, 12-Bit ADCs TIMING CHARACTERISTICS (V = +2.7V to +3.6V REF Typical values are and T = +25°C PARAMETER SYMBOL SCLK Pulse-Width High ...

Page 5

Single-Supply, Low-Power +3V 2.048V REF values are measured +25°C) A MAXIMUM RECOMMENDED f vs. V SCLK 1.8 2.1 2.4 ...

Page 6

Single-Supply, Low-Power, True-Differential, 12-Bit ADCs (V = +3V 2.048V REF values are measured +25°C) A DYNAMIC PERFORMANCE vs. INPUT FREQUENCY (MAX1224) 70.00 69.75 69.50 69.25 69.00 ...

Page 7

Single-Supply, Low-Power +3V 2.048V REF values are measured +25°C) A TOTAL HARMONIC DISTORTION vs. SOURCE IMPEDANCE -50 - 500kHz IN -70 -80 ...

Page 8

Single-Supply, Low-Power, True-Differential, 12-Bit ADCs (V = +3V 2.048V REF values are measured +25° SUPPLY CURRENT DD vs. CONVERSION RATE ...

Page 9

Single-Supply, Low-Power REF AIN+ 12-BIT T/H SAR ADC AIN- CONTROL LOGIC AND TIMING MAX1224 MAX1225 RGND Figure 3. Functional Diagram Detailed Description The MAX1224/MAX1225 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 MAX1224/MAX1225 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 MAX1224/MAX1225 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 (MAX1224 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 MAX1224/MAX1225 ______________________________________________________________________________________ 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 MAX1224 SCLK MAX1225 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 ...

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