Datasheet

ManualsBrandsMAXIM INTEGRATED ManualsData collecting ICsData acquisition IC - AD converter (ADC) External SSOP 28

_______________General Description

The MAX113/MAX117 are microprocessor-compatible,

8-bit, 4-channel and 8-channel analog-to-digital con-

verters (ADCs). They operate from a single +3V supply

and use a half-flash technique to achieve a 1.8µs con-

version time (400ksps). A power-down pin (PWRDN)

reduces current consumption to 1µA typical. The

devices return from power-down mode to normal oper-

ating mode in less than 900ns, allowing large supply-

current reductions in burst-mode applications. (In burst

mode, the ADC wakes up from a low-power state at

specified intervals to sample the analog input signals.)

Both converters include a track/hold, enabling the ADC

to digitize fast analog signals.

Microprocessor (µP) interfaces are simplified because

the ADC can appear as a memory location or I/O port

without external interface logic. The data outputs use

latched, three-state buffer circuitry for direct connection

to an 8-bit parallel µP data bus or system input port.

The MAX113/MAX117 input/reference configuration

enables ratiometric operation.

The 4-channel MAX113 is available in a 24-pin DIP or

SSOP. The 8-channel MAX117 is available in a 28-pin

DIP or SSOP. For +5V applications, refer to the

MAX114/MAX118 data sheet.

________________________Applications

Battery-Powered Systems Portable Equipment

System-Health Monitoring Remote Data Acquisition

Communications Systems

____________________________Features

♦ +3.0V to +3.6V Single-Supply Operation

♦ 4 (MAX113) or 8 (MAX117) Analog Input Channels

♦ Low Power: 1.5mA (operating mode)

1µA (power-down mode)

♦ Total Unadjusted Error ≤ 1LSB

♦ Fast Conversion Time: 1.8µs per Channel

♦ No External Clock Required

♦ Internal Track/Hold

♦ Ratiometric Reference Inputs

♦ Internally Connected 8th Channel Monitors

Reference Voltage (MAX117)

MAX113/MAX117

+3V, 400ksps, 4/8-Channel,

8-Bit ADCs with 1µA Power-Down

________________________________________________________________

Maxim Integrated Products

4-BIT

DAC

4-BIT

FLASH

ADC

(4MSBs)

4-BIT

FLASH

ADC

(4LSBs)

TIMING AND

CONTROL

ADDRESS

LATCH 

DECODE



REF+

THREE-

STATE

OUTPUT

DRIVERS

MUX

*IN7

*IN8

REF+

*IN6

*IN5

IN4

IN3

IN2

IN1

A1 A2 REF-

PWRDN

MODE

INT

WR/RDY

MAX113/MAX117

*MAX117 ONLY

_________________________________________________________Functional Diagram

19-1081; Rev 1; 8/96

PART

MAX113CNG

MAX113CAG

MAX113C/D 0°C to +70°C

0°C to +70°C

TEMP. RANGE

PIN-PACKAGE

24 Narrow Plastic DIP

24 SSOP

Dice*

______________Ordering Information

For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800

MAX113ENG

MAX113EAG

MAX113MRG -55°C to +125°C

-40°C to +85°C

-40°C to +85°C 24 Narrow Plastic DIP

24 SSOP

24 Narrow CERDIP**

Ordering Information continued at end of data sheet.

*Dice are specified at T

= +25°C, DC parameters only.

**Contact factory for availability.

Pin Configuration appears at end of data sheet.

Summary of content (12 pages)

PAGE 1
9-1081; Rev 1; 8/96 +3V, 400ksps, 4/8-Channel, 8-Bit ADCs with 1µA Power-Down ____________________________Features The MAX113/MAX117 are microprocessor-compatible, 8-bit, 4-channel and 8-channel analog-to-digital converters (ADCs). They operate from a single +3V supply and use a half-flash technique to achieve a 1.8µs conversion time (400ksps). A power-down pin (PWRDN) reduces current consumption to 1µA typical.
PAGE 2
MAX113/MAX117 +3V, 400ksps, 4/8-Channel, 8-Bit ADCs with 1µA Power-Down ABSOLUTE MAXIMUM RATINGS VDD to GND ..............................................................-0.3V to +7V Digital Input Voltage to GND ......................-0.3V to (VDD + 0.3V) Digital Output Voltage to GND ...................-0.3V to (VDD + 0.3V) REF+ to GND..............................................-0.3V to (VDD + 0.3V) REF- to GND...............................................-0.3V to (VDD + 0.3V) IN_ to GND ..............
PAGE 3
+3V, 400ksps, 4/8-Channel, 8-Bit ADCs with 1µA Power-Down MAX113/MAX117 ELECTRICAL CHARACTERISTICS (continued) (VDD = +3V to +3.6V, REF+ = 3V, REF- = GND, Read Mode (MODE = GND), TA = TMIN to TMAX, unless otherwise noted.) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS LOGIC INPUTS Input High Voltage VINH Input Low Voltage VINL Input High Current IINH CS, WR, RD, PWRDN, A0, A1, A2 MODE 2 V 2.4 CS, WR, RD, PWRDN, A0, A1, A2 0.66 MODE 0.
PAGE 4
MAX113/MAX117 +3V, 400ksps, 4/8-Channel, 8-Bit ADCs with 1µA Power-Down TIMING CHARACTERISTICS (VDD = +3V, TA = +25°C, unless otherwise noted.) (Note 4) PARAMETER SYMBOL CONDITIONS TA = +25°C ALL GRADES MIN Conversion Time (WR-RD Mode) tCWR Conversion Time (RD Mode) TYP tRD < tINTL, CL = 100pF (Note 5) MAX TA = TMIN to TMAX MAX117C/E MIN MAX MAX117M MIN UNITS MAX 1.8 2.06 2.4 µs tCRD 2.0 2.4 2.6 µs Power-Up Time tUP 0.9 1.2 1.
PAGE 5
+3V, 400ksps, 4/8-Channel, 8-Bit ADCs with 1µA Power-Down EFFECTIVE BITS vs. INPUT FREQUENCY (WR-RD MODE) SIGNAL-TO-NOISE RATIO 0 MAX113/117-02 8.0 MAX113/117-01 1.4 7.5 fIN = 30.27kHz VIN = 2.88Vp-p fSAMPLE = 400ksps SNR = 48.8dB -20 VDD = 3.6V 1.0 VDD = 3.3V 0.8 6.5 6.0 5.0 0.4 -100 4.0 -20 20 140 100 60 -60 -80 fSAMPLE = 400kHz VIN = 2.98Vp-p 4.5 1k 10k TEMPERATURE (°C) 100k 40 0 1M 80 120 160 200 FREQUENCY (kHz) INPUT FREQUENCY (Hz) AVERAGE POWER CONSUMPTION vs.
PAGE 6
MAX113/MAX117 +3V, 400ksps, 4/8-Channel, 8-Bit ADCs with 1µA Power-Down ______________________________________________________________Pin Description PIN 6 NAME FUNCTION MAX113 MAX117 — 1 IN6 Analog Input Channel 6 — 2 IN5 Analog Input Channel 5 1 3 IN4 Analog Input Channel 4 2 4 IN3 Analog Input Channel 3 3 5 IN2 Analog Input Channel 2 4 6 IN1 Analog Input Channel 1 5 7 MODE Mode Selection Input. Internally pulled low with a 15µA current source.
PAGE 7
+3V, 400ksps, 4/8-Channel, 8-Bit ADCs with 1µA Power-Down VDD RL = 3k DATA OUTPUTS DATA OUTPUTS CL RL = 3k a) HIGH-Z TO VOH MAX113/MAX117 VDD 3k DATA OUTPUTS DATA OUTPUTS CL 10pF 3k b) HIGH-Z TO VOL a) VOH TO HIGH-Z 10pF b) VOL TO HIGH-Z Figure 1. Load Circuits for Data-Access Time Test Figure 2. Load Circuits for Data-Hold Time Test _______________Detailed Description be started. If the power-down feature is not required, connect PWRDN to VDD.
PAGE 8
MAX113/MAX117 +3V, 400ksps, 4/8-Channel, 8-Bit ADCs with 1µA Power-Down Read Mode (MODE = 0) In read mode, conversions and data access are controlled by the RD input (Figure 3). The comparator inputs track the analog input voltage for the duration of tACQ. A conversion is initiated by driving CS and RD low. With µPs that can be forced into a wait state, hold RD low until output data appears. The µP starts the conversion, waits, and then reads data with a single read instruction.
PAGE 9
+3V, 400ksps, 4/8-Channel, 8-Bit ADCs with 1µA Power-Down tCSS tCSH tWR RD, WR A0–A2 VIN+ IN_ VIN- GND VDD MAX113 REF+ MAX117 +3V tACQ tACQ tAH ADDRESS VALID (N) ADDRESS VALID (N + 1) REF- tIHWR INT 0.1µF 4.7µF Figure 7a. Power Supply as Reference tINTL VIN+ tID D0–D7 OLD DATA (N - 1) MAX113/MAX117 CS VINNEW DATA (N) GND VDD +3V Figure 6. Pipelined Mode Timing (WR = RD) (Mode = 1) 4.7µF 0.1µF 8 1 3 that contain the conversion result (D0–D7).
PAGE 10
MAX113/MAX117 +3V, 400ksps, 4/8-Channel, 8-Bit ADCs with 1µA Power-Down +3V VDD 0.1µF MAX113 REF+ MAX117 MAX872 C1 4.7µF N-FET* RON VIN2 . . . RIN REFPWRDN MAX113 MAX117 MUX 0.1µF T/H PWRDN * IRML2402 Figure 7d. An N-channel MOSFET switches off the reference load during power-down Figure 8. Equivalent Input Circuit Initial Power-Up When power is first applied, perform a conversion to initialize the MAX113/MAX117. Disregard the output data. R VIN_ 1 VIN Bypassing 22pF Use a 4.
PAGE 11
+3V, 400ksps, 4/8-Channel, 8-Bit ADCs with 1µA Power-Down Track/Hold The track/hold enters hold mode when a conversion starts (RD low or WR low). INT goes low at the end of the conversion, at which point the track/hold enters track mode. The next conversion can start after the minimum acquisition time, tACQ. Transfer Function Figure 10 shows the MAX113/MAX117’s nominal transfer function. Code transitions occur halfway between successive-integer LSB values.
PAGE 12
MAX113/MAX117 +3V, 400ksps, 4/8-Channel, 8-Bit ADCs with 1µA Power-Down __Ordering Information (continued) PART TEMP. RANGE ___________________Chip Information PIN-PACKAGE MAX117CPI 0°C to +70°C 28 Wide Plastic DIP MAX117CAI MAX117C/D MAX117EPI 0°C to +70°C 0°C to +70°C -40°C to +85°C 28 SSOP Dice* 28 Wide Plastic DIP MAX117EAI MAX117MJI -40°C to +85°C -55°C to +125°C 28 SSOP 28 Wide CERDIP** TRANSISTOR COUNT: 2011 *Dice are specified at TA = +25°C, DC parameters only.