Rainbow-electronics MAX1303 Uživatelský manuál stáhnout pdf

General Description

The MAX1302/MAX1303 multirange, low-power, 16-bit,

successive-approximation, analog-to-digital converters

(ADCs) operate from a single +5V supply and achieve

throughput rates up to 115ksps. A separate digital sup-

ply allows digital interfacing with 2.7V to 5.25V systems

using the SPI™-/QSPI™-/MICROWIRE™-compatible

serial interface. Partial power-down mode reduces the

supply current to 1.3mA (typ). Full power-down mode

reduces the power-supply current to 1µA (typ).

The MAX1302 provides eight (single-ended) or four

(true differential) analog input channels. The MAX1303

provides four (single-ended) or two (true differential)

analog input channels. Each analog input channel is

independently software programmable for seven

single-ended input ranges (0 to +V

REF

/2, -V

REF

/2 to 0,

0 to +V

REF

, -V

REF

to 0, ±V

REF

/4, ±V

REF

/2, and ±V

REF

and three differential input ranges (±V

REF

/2, ±V

REF

±2 x V

REF

An on-chip +4.096V reference offers a small convenient

ADC solution. The MAX1302/MAX1303 also accept an

external reference voltage between 3.800V and 4.136V.

The MAX1302 is available in a 24-pin TSSOP package

and the MAX1303 is available in a 20-pin TSSOP pack-

age. Each device is specified for operation from -40°C

to +85°C.

Applications

Industrial Control Systems

Data-Acquisition Systems

Avionics

Robotics

Features

♦ Software-Programmable Input Range for Each

Channel

♦ Single-Ended Input Ranges

0 to +V

REF

/2, -V

REF

/2 to 0, 0 to +V

REF

, -V

REF

to 0, ±V

REF

/4, ±V

REF

/2, and ±V

REF

♦ Differential Input Ranges

±V

REF

/2, ±V

REF

, and ±2 x V

REF

♦ Eight Single-Ended or Four Differential Analog

Inputs (MAX1302)

♦ Four Single-Ended or Two Differential Analog

Inputs (MAX1303)

♦ ±6V Overvoltage Tolerant Inputs

♦ Internal or External Reference

♦ 115ksps Maximum Sample Rate

♦ Single +5V Power Supply

♦ 20-/24-Pin TSSOP Package

MAX1302/MAX1303

8-/4-Channel, ±V

REF

Multirange Inputs,

Serial 16-Bit ADCs

________________________________________________________________ Maxim Integrated Products 1

Pin Configurations

Ordering Information

AGND1

AGND2

DD2

AGND3CH2

CH1

CH0

DD1

TOP VIEW

REF

REFCAP

DDO

CH6

CH5

CH4

CH3

DGND

DGNDO

DOUT

SCLKSSTRB

DIN

CH7

TSSOP

MAX1302

19-3576; Rev 1; 12/06

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.

PART

PIN-

PACKAGE

C H A N N EL S

PKG CODE

MAX1302AEUG*

24 TSSOP 8 U24-1

MAX1302BEUG*

24 TSSOP 8 U24-1

MAX1303AEUP* 20 TSSOP 4 U20-2

MAX1303BEUP 20 TSSOP 4 U20-2

SPI and QSPI are trademarks of Motorola, Inc.

MICROWIRE is a trademark of National Semiconductor Corp.

Pin Configurations continued at end of data sheet.

*Future product—contact factory for availability.

Note: All devices are specified over the -40°C to +85°C oper-

ating temperature range.

1 2 3 4 5 6 ... 30 31

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Strany 1 - Serial 16-Bit ADCs

General DescriptionThe MAX1302/MAX1303 multirange, low-power, 16-bit,successive-approximation, analog-to-digital converters(ADCs) operate from a singl

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MAX1302/MAX13038-/4-Channel, ±VREFMultirange Inputs, Serial 16-Bit ADCs10 ____________________________________________________________________________

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MAX1302/MAX13038-/4-Channel, ±VREFMultirange Inputs, Serial 16-Bit ADCs_______________________________________________________________________________

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MAX1302/MAX13038-/4-Channel, ±VREFMultirange Inputs, Serial 16-Bit ADCs12 ____________________________________________________________________________

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MAX1302/MAX13038-/4-Channel, ±VREFMultirange Inputs, Serial 16-Bit ADCs_______________________________________________________________________________

Strany 6

MAX1302/MAX1303Power SuppliesTo maintain a low-noise environment, the MAX1302 andMAX1303 provide separate power supplies for eachsection of circuitry.

Strany 7

As a result, the analog input impedance is relativelyconstant over the input voltage as shown in Figure 5.Single-ended conversions are internally refe

Strany 8

MAX1302/MAX1303Figure 8 illustrates the software-selectable differentialanalog input voltage range that produces a valid digitaloutput. Each analog in

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Figure 6. Simplified Analog Input CircuitMAX1302MAX1303R2R1VSJ*RSOURCEANALOGSIGNALSOURCER2R1VSJ*RSOURCEANALOGSIGNALSOURCEIN_+IN_+*MINIMIZE RSOURCE TO

Strany 10

MAX1302/MAX1303Differential Common-Mode RangeThe MAX1302/MAX1303 differential common-moderange (VCMDR) must remain within -4.75V to +5.5V toobtain val

Strany 11

The shaded area contains the valid common-modevoltage ranges that support the entire FSR.Digital InterfaceThe MAX1302/MAX1303 feature a serial interfa

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MAX1302/MAX13038-/4-Channel, ±VREFMultirange Inputs, Serial 16-Bit ADCs2 _____________________________________________________________________________

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MAX1302/MAX13038-/4-Channel, ±VREFMultirange Inputs, Serial 16-Bit ADCs20 ____________________________________________________________________________

Strany 14

Start BitCommunication with the MAX1302/MAX1303 is accom-plished using the three input data word formats shownin Table 3. Each input data word begins

Strany 15

MAX1302/MAX1303Mode ControlThe MAX1302/MAX1303 contain one byte-wide mode-control register. The timing diagram of Figure 15 showshow to use the mode-c

Strany 16

• User supplies one byte of SCLK, then drives CShigh to relieve processor load while the ADCconverts• After SSTRB transitions high, the user suppliest

Strany 17

MAX1302/MAX1303External Acquisition Mode (Mode 1)The slowest maximum throughput rate is achieved withthe external acquisition method. SCLK controls th

Strany 18

• External-acquisition-mode control byte• Internal-clock-mode control byte• Reset byte• Partial power-down-mode control byteThis prevents the MAX1302/

Strany 19

MAX1302/MAX1303Bridge ApplicationThe MAX1302/MAX1303 convert 1kHz signals moreaccurately than a similar sigma-delta converter thatmight be considered

Strany 20

Differential Nonlinearity (DNL)DNL is the difference between an actual step width andthe ideal value of 1 LSB. A DNL error specification ofgreater tha

Strany 21

MAX1302/MAX1303Unipolar Offset Error-FSR to 0VWhen a zero-scale analog input voltage is applied tothe converter inputs, the digital output is all ones

Strany 22

Effective Number of Bits (ENOB)ENOB indicates the global accuracy of an ADC at aspecific input frequency and sampling rate. With aninput range equal t

Strany 23

MAX1302/MAX13038-/4-Channel, ±VREFMultirange Inputs, Serial 16-Bit ADCs_______________________________________________________________________________

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MAX1302/MAX13038-/4-Channel, ±VREFMultirange Inputs, Serial 16-Bit ADCs30 ____________________________________________________________________________

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MAX1302/MAX13038-/4-Channel, ±VREFMultirange Inputs, Serial 16-Bit ADCsMaxim cannot assume responsibility for use of any circuitry other than circuitr

Strany 26

MAX1302/MAX13038-/4-Channel, ±VREFMultirange Inputs, Serial 16-Bit ADCs4 _____________________________________________________________________________

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MAX1302/MAX13038-/4-Channel, ±VREFMultirange Inputs, Serial 16-Bit ADCs_______________________________________________________________________________

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MAX1302/MAX13038-/4-Channel, ±VREFMultirange Inputs, Serial 16-Bit ADCs6 _____________________________________________________________________________

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MAX1302/MAX13038-/4-Channel, ±VREFMultirange Inputs, Serial 16-Bit ADCs_______________________________________________________________________________

Strany 30

MAX1302/MAX13038-/4-Channel, ±VREFMultirange Inputs, Serial 16-Bit ADCs8 _____________________________________________________________________________

Strany 31

MAX1302/MAX13038-/4-Channel, ±VREFMultirange Inputs, Serial 16-Bit ADCs_______________________________________________________________________________

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