Datasheet

ManualsBrandsMAXIM INTEGRATED ManualsData collecting ICsData acquisition IC - AD converter (ADC) External SSOP 20

General Description

The MAX1132/MAX1133 are 200ksps, 16-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, a +4.096V reference, and

three general-purpose digital output pins (for external

multiplexer or PGA control) in a 20-pin SSOP package.

The excellent dynamic performance (SINAD ≥ 85dB),

high-speed (200ksps), and low power (7.5mA) of these

ADCs, make them ideal for applications such as indus-

trial process control, instrumentation, and medical

applications. The MAX1132 accepts input signals of 0

to +12V (unipolar) or ±12V (bipolar), while the

MAX1133 accepts input signals of 0 to +4.096V (unipo-

lar) or ±4.096V (bipolar). Operating from a single

+4.75V to +5.25V analog supply and a +4.75V to

+5.25V digital supply, power-down modes reduce

current consumption to 1mA at 10ksps and further

reduce supply current to less than 20µA at slower data

rates. A serial strobe output (SSTRB) allows direct con-

nection to the TMS320 family of digital signal proces-

sors. The MAX1132/MAX1133 user can select either the

internal clock, or an external serial-interface clock for

the ADC to perform analog-to-digital conversions.

The MAX1132/MAX1133 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 a PGA.

Applications

Industrial Process Control

Industrial I/O Modules

Data-Acquisition Systems

Medical Instruments

Portable and Battery-Powered Equipment

Features

♦ 200ksps (Bipolar) and 150ksps (Unipolar)

Sampling ADC

♦ 16-Bits, No Missing Codes

♦ 1.5LSB INL Guaranteed

♦ 85dB (min) SINAD

♦ +5V Single-Supply Operation

♦ Low-Power Operation, 7.5mA (Unipolar Mode)

♦ 2.5µA Shutdown Mode

♦ Software-Configurable Unipolar and Bipolar Input

Ranges

0 to +12V and ±12V (MAX1132)

0 to +4.096V and ±4.096V (MAX1133)

Internal or External Reference

♦ Internal or External Clock

♦ SPI/QSPI/MICROWIRE-Compatible Serial Interface

♦ Three User-Programmable Logic Outputs

♦ Small 20-Pin SSOP Package

MAX1132/MAX1133

16-Bit ADC, 200ksps, 5V Single-Supply

with Reference

________________________________________________________________ Maxim Integrated Products 1

TOP VIEW

SHDN

RST

AGND

AIN

CREF

AGND

REFADJ

REF

DIN

DGND

SCLK

SSTRB

DGND

10 DOUT

MAX1132

MAX1133

SSOP

Pin Configuration

19-2083; Rev 0; 8/01

EVALUATION KIT

AVAILABLE

Ordering Information

PART TEMP. RANGE PIN-PACKAGE

INL

(LSB

)

MAX1132ACAP* 0°C to +70°C 20 SSOP ±1.5

MAX1132BCAP 0°C to +70°C 20 SSOP ±2.5

Functional Diagram appears at end of data sheet.

Typical Application Circuit appears at end of data sheet.

SPI and QSPI are trademarks of Motorola, Inc.

MICROWIRE is a trademark of National Semiconductor Corp.

Ordering Information continued at end of data sheet.

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.

Summary of content (19 pages)

PAGE 1
9-2083; Rev 0; 8/01 KIT ATION EVALU E L B AVAILA 16-Bit ADC, 200ksps, 5V Single-Supply with Reference The MAX1132/MAX1133 are 200ksps, 16-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, a +4.096V reference, and three general-purpose digital output pins (for external multiplexer or PGA control) in a 20-pin SSOP package.
PAGE 2
MAX1132/MAX1133 16-Bit ADC, 200ksps, 5V Single-Supply with Reference ABSOLUTE MAXIMUM RATINGS AVDD to AGND, DVDD to DGND .............................-0.3V to +6V AGND to DGND.....................................................-0.3V to +0.3V AIN to AGND.....................................................................±16.5V REFADJ, CREF, REF to AGND.................-0.3V to (AVDD + 0.3V) Digital Inputs to DGND.............................................-0.3V to +6V Digital Outputs to DGND ............
PAGE 3
16-Bit ADC, 200ksps, 5V Single-Supply with Reference (AVDD = DVDD = +5V ±5%, fSCLK = 4.8MHz, external clock (50% duty cycle), 24 clocks/conversion (200ksps), bipolar input, external VREF = +4.096V, VREFADJ = AVDD, CREF = 2.2µF, CCREF = 1µF, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS ANALOG INPUT MAX1132 Input Range MAX1133 MAX1132 Input Impedance MAX1133 Unipolar Bipolar Unipolar Bipolar 0 12 -12 12 0 4.096 -4.
PAGE 4
MAX1132/MAX1133 16-Bit ADC, 200ksps, 5V Single-Supply with Reference ELECTRICAL CHARACTERISTICS (continued) (AVDD = DVDD = +5V ±5%, fSCLK = 4.8MHz, external clock (50% duty cycle), 24 clocks/conversion (200ksps), bipolar input, external VREF = +4.096V, VREFADJ = AVDD, CREF = 2.2µF, CCREF = 1µF, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.) PARAMETER SYMBOL CONDITIONS Capacitive Bypass at REF MIN TYP 0.
PAGE 5
16-Bit ADC, 200ksps, 5V Single-Supply with Reference (AVDD = DVDD = +5V ±5%, TA = TMIN to TMAX, unless otherwise noted.) PARAMETER Acquisition Time DIN to SCLK Setup SYMBOL CONDITIONS MIN TYP MAX UNITS tACQ 1.
PAGE 6
Typical Operating Characteristics (MAX1132/MAX1133: AVDD = DVDD = +5V , fSCLK = 4.8MHz, external clock (50% duty cycle), 24 clocks/conversion (200ksps), bipolar input, external REF = +4.096V, 0.22µF bypassing on REFADJ, 2.2µF on REF, 1µF on CREF, TA = 25°C, unless otherwise noted.) DIFFERENTIAL NONLINEARITY vs. DIGITAL OUTPUT CODE 0 -0.5 -1.0 0.6 0.4 0.2 0 -0.2 -0.4 -0.6 11.5 10.1 A 9.9 -40 0.04 A: AVDD, DVDD = +4.75V B: AVDD, DVDD = +5.00V C: AVDD, DVDD = +5.25V 0.03 C 0.02 B 0.
PAGE 7
16-Bit ADC, 200ksps, 5V Single-Supply with Reference SFDR PLOT 100 -20 90 -30 80 AMPLITUDE (dB) AMPLITUDE (dB) fSAMPLE = 200kHz -10 MAX1132 toc11 fSAMPLE = 200kHz 110 THD PLOT 0 MAX1132 toc10 120 70 60 50 40 -40 -50 -60 -70 -80 30 20 -90 10 -100 0 -110 0.1 1 10 100 0.1 FREQUENCY (kHz) 1 10 100 FREQUENCY (kHz) Pin Description PIN NAME FUNCTION Reference Buffer Output/ADC Reference Input. Reference voltage for analog-to-digital conversion.
PAGE 8
16-Bit ADC, 200ksps, 5V Single-Supply with Reference MAX1132/MAX1133 Pin Description (continued) PIN NAME FUNCTION 13 SCLK Serial Data Clock Input. Serial data on DIN is loaded on the rising edge of SCLK, and serial data is updated on DOUT on the falling edge of SCLK. In external clock mode, SCLK sets the conversion speed. 14 DGND Digital Ground. Connect to pin 5. 15 DVDD Digital Supply. 5V ±5%. Bypass DVDD to DGND (pin 14) with a 0.1µF capacitor. 16 DIN Serial Data Input.
PAGE 9
16-Bit ADC, 200ksps, 5V Single-Supply with Reference VOLTAGE REFERENCE S1 UNIPOLAR R1 2.5kΩ R2 CHOLD 30pF TRACK S2 AIN T/H OUT R3 HOLD TRACK HOLD S3 S1 = BIPOLAR/UNIPOLAR S2, S3 = T/H SWITCH R2 = 7.6kΩ (MAX1132) OR 2.5kΩ (MAX1133) R3 = 3.9kΩ (MAX1132) OR INFINITY (MAX1133) Figure 1. Equivalent Input Circuit The DIN input accepts Control Byte data which is clocked in on each rising edge of SCLK.
PAGE 10
MAX1132/MAX1133 16-Bit ADC, 200ksps, 5V Single-Supply with Reference Table 1. Control Byte Format BIT NAME 7 (MSB) START The first logic “1” bit, after CS goes low, defines the beginning of the Control Byte 6 UNI/BIP 1 = unipolar, 0 = bipolar. Selects unipolar or bipolar conversion mode. In unipolar mode, analog input signals from 0 to +12V (MAX1132) or 0 to VREF (MAX1133) can be converted. In bipolar mode analog input signals from -12V to +12V (MAX1132) or -VREF to +VREF (MAX1133) can be converted.
PAGE 11
16-Bit ADC, 200ksps, 5V Single-Supply with Reference MAX1132/MAX1133 CS tACQ SCLK DIN 1 4 UNI/ START BIP INT/ EXT M1 8 M0 P2 P1 15 19 29 32 P0 SSTRB B15 MSB DOUT A/D STATE IDLE B14 B13 ACQUISITION B4 CONVERSION B3 B2 B1 B0 FILLED WITH ZEROS LSB IDLE Figure 3. Long Acquisition Mode (32-Clock Cycles) External Clock, Bipolar Mode low for a maximum of 6µs, during which time SCLK should remain low for best noise performance.
PAGE 12
MAX1132/MAX1133 16-Bit ADC, 200ksps, 5V Single-Supply with Reference CS tACQ 1 SCLK UNI/ START BIP DIN 4 INT/ EXT M1 9 8 M0 P2 P1 21 24 P0 SSTRB tCONV B15 MSB DOUT B14 B13 B4 B3 B2 B1 B0 LSB FILLED WITH ZEROS Figure 4. Internal Clock Mode Timing, Short Acquisition, Bipolar Mode CS tCONV tCSS tSCK tCSH SSTRB t SSTRB SCLK P0 CLOCK IN NOTE: FOR BEST NOISE PERFORMANCE, KEEP SCLK LOW DURING CONVERSION. Figure 5.
PAGE 13
16-Bit ADC, 200ksps, 5V Single-Supply with Reference Reference The MAX1132/MAX1133 can be used with an internal or external reference. An external reference can be connected directly at the REF pin or at the REFADJ pin. CREF is an internal reference node and must be bypassed with a 1µF capacitor when using either the internal or an external reference. Internal Reference When using the MAX1132/MAX1133’s internal reference, place a 0.22µF ceramic capacitor from REFADJ to AGND and place a 2.
PAGE 14
MAX1132/MAX1133 16-Bit ADC, 200ksps, 5V Single-Supply with Reference Table 3. Unipolar Full Scale and Zero Scale PART REFERENCE ZERO SCALE FULL SCALE Internal 0 +12V External 0 +12(VREF/4.096) Internal 0 +4.096V External 0 +VREF MAX1132 MAX1133 Table 4. Bipolar Full Scale, Zero Scale, and Negative Scale PART MAX1132 MAX1133 REFERENCE NEGATIVE FULL SCALE ZERO SCALE FULL SCALE Internal -12V 0 +12V External -12(VREF/4.096) 0 +12(VREF/4.096) Internal -4.096V 0 +4.
PAGE 15
16-Bit ADC, 200ksps, 5V Single-Supply with Reference MAX1132/MAX1133 1kΩ +15V 100pF 0.1µF 2 7 6 IN 3 MAX427 20Ω ELANTEC EL2003 AIN 4 0.0033µF 0.1µF -15V Figure 8. AIN Buffer for AC/DC Use Mode 2 Long Acquisition Mode (32 SCLK) Configure long acquisition by setting M1 = 1 and M0 = 1. In long acquisition mode, the acquisition time is 13.5 clock cycles. The total period is 32 clock cycles per conversion. 510Ω +5V 0.1µF 2 7 22Ω 6 IN 3 AIN MAX410 4 0.1µF 0.1µF -5V Figure 9.
PAGE 16
MAX1132/MAX1133 16-Bit ADC, 200ksps, 5V Single-Supply with Reference shutdown is long enough that the supply voltage or ambient temperature may have changed. Supplies, Layout, Grounding and Bypassing For best system performance, use separate analog and digital ground planes. The two ground planes should be tied together at the MAX1132/MAX1133. Use pins 3 and 14 as the primary AGND and DGND, respectively.
PAGE 17
16-Bit ADC, 200ksps, 5V Single-Supply with Reference MAX1132/MAX1133 OUTPUT CODE OUTPUT CODE FULL-SCALE TRANSITION 11 . . . 111 011 . . . 111 11 . . . 110 011 . . . 110 11 . . . 101 000 . . . 010 +FS = +4.096V -FS = -4.096V 1LSB = 8.192 65536 000 . . . 001 FS = +2.048V 1LSB = FS 65536 000 . . . 000 111 . . . 111 111 . . . 110 111 . . . 101 00 . . . 011 00 . . . 010 100 . . . 001 00 . . . 001 100 . . . 000 00 . . . 000 0 1 2 3 INPUT VOLTAGE (LSBs) FS FS - 3/2LSB Figure 10.
PAGE 18
16-Bit ADC, 200ksps, 5V Single-Supply with Reference MAX1132/MAX1133 Functional Diagram AVDD AGND 9kΩ CREF REFADJ MAX1132 MAX1133 REFERENCE REF AIN INPUT SCALING NETWORK DAC COMPARATOR ANALOG TIMING CONTROL DVDD SSTRB DGND CS SERIAL INPUT PORT SCLK DIN MEMORY CLOCK GENERATOR SHDN +5V SHDN AIN DVDD MAX1132 MAX1133 CREF REF REFADJ CS SCLK DIN DOUT RST SSTRB Ordering Information (continued) 0.1µF MC68HCXX I/O SCLK MOSI MISO I/O PIN-PACKAGE INL (LSB) -40°C to +85°C 20 SSOP ±1.
PAGE 19
16-Bit ADC, 200ksps, 5V Single-Supply with Reference SSOP.EPS 2 1 INCHES E H MILLIMETERS DIM MIN MAX MIN MAX A 0.068 0.078 1.73 1.99 A1 0.002 0.008 0.05 0.21 B 0.010 0.015 0.25 0.38 C D 0.20 0.09 0.004 0.008 SEE VARIATIONS E 0.205 e 0.212 0.0256 BSC D D D D D 5.38 5.20 MILLIMETERS INCHES MIN MAX MIN MAX 0.239 0.239 0.278 0.249 0.249 0.289 6.07 6.07 7.07 6.33 6.33 7.33 0.317 0.397 0.328 0.407 8.07 10.07 8.33 10.33 N 14L 16L 20L 24L 28L 0.65 BSC H 0.301 0.