Datasheet

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MAX153 1Msps, µP-Compatible,

8-Bit ADC with 1µA Power-Down

General Description

The MAX153 high-speed, microprocessor (µP)-compatible,

8-bit analog-to-digital converter (ADC) uses a half-flash

technique to achieve a 660ns conversion time, and digitiz-

es at a rate of 1M samples per second (Msps). It operates

with single +5V or dual ±5V supplies and accepts either

unipolar or bipolar inputs. A POWERDN (power-down)

pin reduces current consumption to a typical value of 1µA

(with 5V supply). The part returns from power-down to

normal operating mode in less than 200ns, providing large

reductions in supply current in applications with burst-

mode input signals.

The MAX153 is DC and dynamically tested. Its µP interface

appears as a memory location or input/output port that

requires no external interface logic. The data outputs use

latched, three-state buffered circuitry for direct connection

to a µP data bus or system input port. The ADC’s input/

reference arrangement enables ratiometric operation.

Applications

● CellularTelephones

● PortableRadios

● Battery-PoweredSystems

● Burst-ModeDataAcquisition

● Digital-SignalProcessing

● Telecommunications

● High-SpeedServoLoops

Features

● 660nsConversionTime

● Power-Up/Power-Downin200ns

● InternalTrack/Hold

● 1MspsThroughput

● LowPower

40mW (Operating Mode)

5µW (Power-Down Mode)

● 1MHzFull-PowerBandwidth

● 20-PinNarrowDIP,SO,andSSOPPackages

● NoExternalClockRequired

● Unipolar/BipolarInputs

● Single+5VorDual±5VSupplies

● RatiometricReferenceInputs

19-4740; Rev 2; 1/12

Ordering Information appears at end of data sheet.

For related parts and recommended products to use with this part, refer

to www.maximintegrated.com/MAX153.related.

Functional Diagram

4-BIT

FLASH

ADC

4-BIT

FLASH

ADC

(4 LSB)

TIMING AND CONTROL

CIRCUITRY

MAX153

GND MODE

WR/RDY

CS RD INT

THREE-

STATE

DRIVERS

D0–D7

DATA

OUT

PINS

2–5,

14–17

REF+

REF-

PWRDN

4-BIT

DAC

REF+

7 6 3 7 7

Summary of content (13 pages)

PAGE 1
MAX153 General Description The MAX153 high-speed, microprocessor (µP)-compatible, 8-bit analog-to-digital converter (ADC) uses a half-flash technique to achieve a 660ns conversion time, and digitizes at a rate of 1M samples per second (Msps). It operates with single +5V or dual ±5V supplies and accepts either unipolar or bipolar inputs. A POWERDN (power-down) pin reduces current consumption to a typical value of 1µA (with 5V supply).
PAGE 2
MAX153 1Msps, µP-Compatible, 8-Bit ADC with 1µA Power-Down Absolute Maximum Ratings (All voltages referenced to GND.) VDD...........................................................................-0.3V to +7V VSS...........................................................................+0.3V to -7V Digital Input Voltage................................ +0.3V to (VDD + 0.3V) Digital Output Voltage.............................. -0.3V to (VDD + 0.3V) VREF+, VREF+, VIN......................... (VSS - 0.
PAGE 3
MAX153 1Msps, µP-Compatible, 8-Bit ADC with 1µA Power-Down Electrical Characteristics (continued) (VDD = +5V ±5%, VGND = 0V; Unipolar Input Range: VSS = GND, VREF+ = 5V, VREF- = GND; Bipolar Input Range: VSS = -5V ±5%, VREF+ = 2.5V, VREF- = -2.5V; 100% production tested, specifications are given for RD Mode (MODE = GND), TA = TMIN to TMAX, unless otherwise noted.
PAGE 4
MAX153 1Msps, µP-Compatible, 8-Bit ADC with 1µA Power-Down TIMING CHARACTERISTICS (Note 5) (VDD = +5V ±5%, VSS = 0V for Unipolar Input Range, VSS = -5V ±5% for Bipolar Input Range, 100% production tested, TA = +25°C, unless otherwise noted.
PAGE 5
MAX153 1Msps, µP-Compatible, 8-Bit ADC with 1µA Power-Down TIMING CHARACTERISTICS (Note 5) (continued) (VDD = +5V ±5%, VSS = 0V for Unipolar Input Range, VSS = -5V ±5% for Bipolar Input Range, 100% production tested, TA = +25°C, unless otherwise noted.
PAGE 6
MAX153 1Msps, µP-Compatible, 8-Bit ADC with 1µA Power-Down 1.5 1.4 1.3 8.0 7.5 HOT +125°C EFFECTIVE BITS 7.0 1.2 VDD = +4.75V 1.1 1.0 VDD = +5.25V 0.9 VDD = +5V 0.7 -60 -40 -20 0 COLD -55°C ROOM 6.5 6.0 5.5 5.0 0.8 0.6 EFFECTIVE BITS vs. INPUT FREQUENCY, WR-RD MODE ISAMPLE = 1MHz VIN = ±2.5V 4.5 4.0 20 40 60 80 100 120 140 10 TEMPERATURE (°C) INPUT FREQUENCY = 195.8ksps (±2.5V) SAMPLE FREQUENCY = 1MHz SNR = 49.1dB -40 -60 -80 -80 -100 -100 100 200 300 FREQUENCY (kHz) www.
PAGE 7
MAX153 1Msps, µP-Compatible, 8-Bit ADC with 1µA Power-Down Pin Configuration TOP VIEW + VIN 1 20 VDD D0 (LSB) 2 19 VSS D1 3 18 PWRDN D2 4 D3 5 WR/RDY 6 15 D5 MODE 7 14 D4 RD 8 13 CS INT 9 12 VREF+ GND 10 11 VREF- MAX153 17 D7 (MSB) 16 D6 PDIP/SO(W)/SSOP Pin Description PIN NAME 1 VIN Analog Input. Range is VREF- > VIN < VREF+. FUNCTION Three-State Data Output (LSB) 2 D0 3–5 D1–D3 6 WR/RDY 7 MODE 8 RD READ Input. Must be low to access data*.
PAGE 8
MAX153 Detailed Description Converter Operation The MAX153 uses a half-flash conversion technique (see the Functional Diagram) in which two 4-bit flash ADC sections achieve an 8-bit result. Using 15 comparators, the flash ADC compares the unknown input voltage to the reference ladder and provides the upper 4 data bits.
PAGE 9
MAX153 1Msps, µP-Compatible, 8-Bit ADC with 1µA Power-Down CS CS RD tWR tCSH WR tCSS tRI tINTH INT tCRD D0–D7 VALID DATA tACC0 tP tREAD1 RD WITH EXTERNAL PULLUP tRDY tRD tCSS tP RDY INT tCSH tINTH DATA VALID D0–D7 tACC1 tCWR tDH Figure 3. RD Mode Timing (MODE = 0) tDH Figure 5.
PAGE 10
MAX153 1Msps, µP-Compatible, 8-Bit ADC with 1µA Power-Down The internal resistances from VREF+ and VREF- may be as low as 1kΩ. Since current is still drawn by the reference inputs during power-down, reference supply current can be reduced during shutdown by using the circuit shown in Figure 7d. A logic-level n-channel MOSFET, connected between VREF- and ground, disconnects the reference load when the ADC enters power-down. (PWRDN = low). The FET should have no more than 0.
PAGE 11
MAX153 1Msps, µP-Compatible, 8-Bit ADC with 1µA Power-Down MAX153 MAX153 VIN RIN RON 1 VIN VIN R 1 VIN 2kΩ 12pF C 10pF Figure 8. Equivalent Input Circuit Figure 9. RC Network Equivalent Input Model Conversion Rate The effective resolution, or effective number of bits, the ADC provides can be measured by transposing the equation that converts resolution to SNR: N = (SNR 1.76)/6.02.
PAGE 12
MAX153 1Msps, µP-Compatible, 8-Bit ADC with 1µA Power-Down Ordering Information PART TEMP RANGE Package Information PIN-PACKAGE MAX153CAP+ 0°C to +70°C 20 SSOP** MAX153CPP+ 0°C to +70°C 20 PDIP MAX153CWP+ 0°C to +70°C 20 SO(W) MAX153C/D 0°C to +70°C Dice* MAX153EAP+ -40°C to +85°C MAX153EPP+ -40°C to +85°C MAX153EWP+ -40°C to +85°C 20 SSOP** 20 PDIP 20 Wide SO +Denotes a lead(Pb)-free/RoHS-compliant package.
PAGE 13
MAX153 1Msps, µP-Compatible, 8-Bit ADC with 1µA Power-Down Revision History REVISION NUMBER REVISION DATE 0 7/92 Initial release — 1 10/93 Corrected die topography 11 2 1/12 Removed military packages DESCRIPTION PAGES CHANGED 1–5 For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxim Integrated’s website at www.maximintegrated.com.