MAX1093AEEG+【PDF 7/20 页】IC ADC 10BIT 250KSPS 24-QSOP

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Sheet目录2007

3页 4页 5页 6页 [7页]8页 9页 10页 11页

MAX1091/MAX1093

250ksps, +3V, 8-/4-Channel, 10-Bit ADCs

with +2.5V Reference and Parallel Interface

______________________________________________________________________________________

Table 4. Channel Selection for Pseudo-Differential Operation (SGL/DIF = 0)

*Channels CH4–CH7 apply to MAX1091 only.

CH0

CH2

CH4*

CH3

CH1

CH7*

CH6*

CH5*

Applications Information

Power-On Reset

When power is first applied, internal power-on reset cir-

cuitry activates the MAX1091/MAX1093 in external

clock mode and sets INT high. After the power supplies

stabilize, the internal reset time is 10s, and no conver-

sions should be attempted during this phase. When

using the internal reference, 500s is required for VREF

to stabilize.

Internal and External Reference

The MAX1091/MAX1093 can be used with an internal

or external reference voltage. An external reference

can be connected directly to REF or REFADJ.

An internal buffer is designed to provide +2.5V at REF for

the both the MAX1091 and the MAX1093. The internally

trimmed +1.22V reference is buffered with a +2.05V/V

gain.

Internal Reference

With the internal reference, the full-scale range is +2.5V

with unipolar inputs and ±1.25V with bipolar inputs. The

internal reference buffer allows for small adjustments

(±100mV) in the reference voltage (Figure 7).

Note: The reference buffer must be compensated with

an external capacitor (4.7F min) connected between

REF and GND to reduce reference noise and switching

spikes from the ADC. To further minimize noise on the

reference, connect a 0.01F capacitor between

REFADJ and GND.

External Reference

With both the MAX1091 and MAX1093, an external ref-

erence can be placed at either the input (REFADJ) or

the output (REF) of the internal reference buffer amplifier.

Using the REFADJ input makes buffering the external

reference unnecessary. The REFADJ input impedance

is typically 17k

Table 5. Data-Bus Output (8 + 2 Parallel

Interface)

UNIPOLAR

(UNI/BIP = 1)

BIPOLAR

(UNI/BIP = 0)

Bit 9

Bit 7

Bit 9

Bit 6

Bit 9

Bit 2

Bit 9 (MSB)

Bit 1

HBEN = 1

Bit 8

HBEN = 0

Bit 0 (LSB)

PIN

VDD = +3V

330k

50k

GND

50k

0.01

4.7

REFADJ

REF

MAX1091

MAX1093

GND

Figure 7. Reference Voltage Adjustment with External

Potentiometer

Bit 9

Bit 3

Bit 9

Bit 4

Bit 9

Bit 5

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