MAX1144BCAP Maxim Integrated, MAX1144BCAP Datasheet

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MAX1144BCAP

Manufacturer Part Number
MAX1144BCAP
Description
Analog to Digital Converters - ADC
Manufacturer
Maxim Integrated
Datasheet

Specifications of MAX1144BCAP

Number Of Channels
1
Architecture
SAR
Conversion Rate
150 KSPs
Resolution
14 bit
Input Type
Single-Ended
Snr
82 dB
Interface Type
QSPI, Serial (SPI, Microwire)
Operating Supply Voltage
3.135 V to 3.465 V
Maximum Operating Temperature
+ 70 C
Package / Case
SSOP-20
Maximum Power Dissipation
640 mW
Minimum Operating Temperature
0 C
Number Of Converters
1
Voltage Reference
2.2 V
Functional Diagram and Typical Application Circuit appear
at end of data sheet.
The MAX1144/MAX1145 are 150ksps, 14-bit ADCs.
These serially interfaced ADCs connect directly to
SPI™, QSPI™, and MICROWIRE™ devices without
external logic. They combine an input scaling network,
internal track/hold, clock, and three general-purpose
digital output pins (for external multiplexer or PGA con-
trol) in a 20-pin SSOP package. The excellent dynamic
performance (THD ≥ 90dB), high speed (150ksps in
bipolar mode), and low power (8.0mA) of these ADCs
make them ideal for applications such as industrial
process control, instrumentation, and medical applica-
tions.
The MAX1144 accepts input signals of 0 to +6V (unipo-
lar) or ±6V (bipolar), while the MAX1145 accepts input
signals of 0 to +2.048V (unipolar) or ±2.048V (bipolar).
Operating from a single 3.135V to 3.465V analog digital
supply, powerdown modes reduce current consump-
tion to 0.15mA at 10ksps and further reduce supply
current to less than 20µA slower data rates.
A serial strobe output (SSTRB) allows direct connection
to the TMS320 family digital-signal processors. The
MAX1144/MAX1145 user can select either the internal
clock or an external serial-interface clock for the ADC to
perform analog-to-digital conversions.
The MAX1144/MAX1145 feature internal calibration cir-
cuitry to correct linearity and offset errors. On-demand
calibration allows the user to optimize performance.
Three user-programmable logic outputs are provided
for the control of an 8-channel mux or PGA.
The MAX1144/MAX1145 are available in a 20-pin SSOP
package and are fully specified over the -40°C to
+85°C temperature range.
19-2465; Rev 0; 4/02
SPI and QSPI are trademarks of Motorola, Inc.
MICROWIRE is a trademark of National Semiconductor, Corp.
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
Industrial Process Control
Industrial I/O Modules
Data-Acquisition Systems
Medical Instruments
Portable and Battery-Powered Equipment
14-Bit ADCs, 150ksps, 3.3V Single Supply
________________________________________________________________ Maxim Integrated Products
General Description
Applications
o 150ksps (Bipolar) and 125ksps (Unipolar)
o 14 Bits, No Missing Codes
o 1LSB INL Guaranteed
o -100dB THD
o 3.3V Single-Supply Operation
o Low-Power Operation
o 1.2µA Shutdown Mode
o Software-Configurable Unipolar and Bipolar Input
o Internal or External Clock
o SPI/QSPI/MICROWIRE TMS320-Compatible Serial
o Three User-Programmable Logic Outputs
o Small 20-Pin SSOP Package
Ordering Information continued at end of data sheet.
MAX1144ACAP
MAX1144BCAP
MAX1144AEAP
MAX1144BEAP
Sampling ADC
Ranges
Interface
5mA typ (Unipolar Mode)
0 to +6V and ±6V (MAX1144)
0 to +2.048V and ±2.048V (MAX1145)
PART
TOP VIEW
SSTRB
AGND
DGND
SHDN
AV
AV
REF
PO
DD
DD
P2
P1
-40°C to +85°C
-40°C to +85°C
0°C to +70°C
0°C to +70°C
10
1
2
3
4
5
6
7
8
9
RANGE
Ordering Information
TEMP
MAX1144
MAX1145
SSOP
Pin Configuration
20
19
18
17
16
15
14
13
12
11
PIN-
PACKAGE
20 SSOP
20 SSOP
20 SSOP
20 SSOP
AIN
AGND
CREF
CS
DIN
DV
DGND
SCLK
RST
DOUT
DD
Features
(LSB)
INL
±1
±2
±1
±2
1

Related parts for MAX1144BCAP

MAX1144BCAP Summary of contents

Page 1

... Internal or External Clock o SPI/QSPI/MICROWIRE TMS320-Compatible Serial Interface o Three User-Programmable Logic Outputs o Small 20-Pin SSOP Package PART MAX1144ACAP MAX1144BCAP MAX1144AEAP MAX1144BEAP Ordering Information continued at end of data sheet. Applications TOP VIEW Features Ordering Information TEMP ...

Page 2

ADCs, 150ksps, 3.3V Single Supply ABSOLUTE MAXIMUM RATINGS AV to AGND DGND ..............................-0. AGND to DGND.....................................................-0.3V to +0.3V AIN to AGND ....................................................................±16.5V CREF, REF to AGND ................................-0.3V to (AV Digital Inputs to DGND.............................................-0.3V ...

Page 3

ADCs, 150ksps, 3.3V Single Supply ELECTRICAL CHARACTERISTICS (continued) ( 3.3V ±5 3.6MHz, external clock (50% duty cycle), 24 clocks/conversion (150ksps), bipolar input SCLK 2.048V 4.7µ 1µF, T ...

Page 4

ADCs, 150ksps, 3.3V Single Supply ELECTRICAL CHARACTERISTICS (continued) ( 3.3V ±5 3.6MHz, external clock (50% duty cycle), 24 clocks/conversion (150ksps), bipolar input SCLK 2.048V 4.7µ 1µF, T ...

Page 5

ADCs, 150ksps, 3.3V Single Supply TIMING CHARACTERISTICS (Figures 5 and 6) (continued) ( 3.3V ±5 MIN Note 1: Tested 3.3V, bipolar input mode ...

Page 6

ADCs, 150ksps, 3.3V Single Supply (MAX1144/MAX1145 3.3V bipolar input, REF = 2.048V, 4.7µF on REF, 1µF on CREF, T OFFSET VOLTAGE vs. TEMPERATURE 3.135V DD DD ...

Page 7

ADCs, 150ksps, 3.3V Single Supply PIN NAME 1 REF ADC Reference Input. Connect a 2.048V voltage source to REF. Bypass REF to AGND with 4.7µF capacitor Analog Supply. Connect to pin AGND Analog Ground. ...

Page 8

ADCs, 150ksps, 3.3V Single Supply Detailed Description The MAX1144/MAX1145 ADCs use a successive- approximation technique and input track/hold (T/H) cir- cuitry to convert an analog signal to a 14-bit digital output. The MAX1144/MAX1145 easily interface to microprocessors (µPs). The ...

Page 9

ADCs, 150ksps, 3.3V Single Supply CS t ACQ 1 4 SCLK UNI/ INT START BIP EXT DIN SSTRB DOUT A/D IDLE ACQUISITION STATE Figure 2. Short Acquisition Mode (24 Clock Cycles) External Clock Table 2. User-Programmable Outputs ...

Page 10

ADCs, 150ksps, 3.3V Single Supply SCLK UNI/ INT START BIP EXT DIN SSTRB DOUT A/D IDLE STATE Figure 3. Long Acquisition Mode (32 Clock Cycles) External Clock CS t SDV SSTRB SCLK Figure 4. ...

Page 11

ADCs, 150ksps, 3.3V Single Supply CS t ACQ 1 4 SCLK UNI/ INT START BIP EXT DIN SSTRB DOUT Figure 5. Internal Clock Mode Timing, Short Acquisition, Bipolar Mode CS SSTRB SCLK P0 CLOCKED IN Figure 6. ...

Page 12

ADCs, 150ksps, 3.3V Single Supply Table 3. Unipolar Full Scale and Zero Scale PART ZERO SCALE MAX1144 0 MAX1145 0 When internal clock mode is selected, SSTRB does not go into a high-impedance state when CS goes high. Figure ...

Page 13

ADCs, 150ksps, 3.3V Single Supply Figure 7. AIN Buffer for AC/DC Use Input Acquisition and Settling Clocking in a control byte starts input acquisition. The main capacitor array starts acquiring the input as soon as a ...

Page 14

ADCs, 150ksps, 3.3V Single Supply magnitude of the offset produced by a synchronous signal depends on the signal’s shape, recalibration may be appropriate if the shape or relative timing of the clock or other digital signals change, which can ...

Page 15

ADCs, 150ksps, 3.3V Single Supply OUTPUT CODE FULL-SCALE TRANSITION 111 110 101 011 010 001 ...

Page 16

ADCs, 150ksps, 3.3V Single Supply Signal-to-Noise Plus Distortion Signal-to-noise plus distortion (SINAD) is the ratio of the fundamental input frequency’s RMS amplitude to the RMS equivalent of all other ADC output signals: SINAD (dB log (Signal ...

Page 17

ADCs, 150ksps, 3.3V Single Supply Typical Application Circuit 3.3V 0.1µ SHDN DV DD AIN MAX1144/ MAX1145 CS SCLK DIN 2.048V DOUT RST REF SSTRB CREF DGND AGND 4.7µF 1µF ______________________________________________________________________________________ Ordering Information (continued) PART MAX1145ACAP MAX1145BCAP MAX1145AEAP ...

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 © 2002 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products ...

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