MX7672(2012) 查看數據表（PDF） - Maxim Integrated

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MX7672
(Rev.:2012)

High-Speed 12-Bit ADC With External Reference Input Part

Maxim Integrated 

MX7672

High-Speed 12-Bit ADC With External

Reference Input Part

For synchronous RD and CLKIN, the hold settling time

allowed for the sample-and-hold is 375ns (MX7672_03),

600ns (MX7672_ _05), and 1.5µs (MX7672_ _ 10).

The maximum sampling rate is 125kHz with a 2.5MHz

clock and 64.5kHz with a 1MHz clock, allowing for a 3µs

sample-and-hold acquisition time.

Although this circuit works well for the 1MHz clock rate, a

faster sample-and-hold amplifier, such as the HA5320, is

recommended at a 2.5MHz clock rate.

MX7672_ _03—Figure 14 is the MX7672_ _03 to HA5320

interface. The maximum sampling rate is 210kHz wtth a

4MHz clock, which allows a 1.5µs acquisition time. The

HA5320 can also be replaced by a HA5330 for higher

throughput.

Analog Input Ranges

The MX7672 provides three selectable analog input

ranges: 0 to +5V, 0 to +10V, and ±5V. Figure 15 shows the

configuration for the two analog inputs (AIN1 and AIN2)

for these ranges.

Unipolar Operation

Figure 16 shows unipolar operation using an MX584 volt-

age reference configured for -5V.

Figure 17 shows the nominal input/output transfer function

of the MX7672. Code transitions occur halfway between

successive integer LSB values. The output coding is

binary with 1 LSB = Full Scale (FS)/4096. FS is either +5V

or +10V, based on the analog input configurations.

Offset and Full-Scale Adjustment

In applications requiring offset and FS range adjust-

ment, use the circuit in Figure 18. Note: The amplifier

shown could also be a sample-and-hold. Offset should be

adjusted first. Apply ½ LSB (0.61mV) at the analog input

(AIN1 or AIN2) and adjust the offset of the amplifier until

Figure 15. Analog Input Range Configurations

Figure 16. Unipolar Operation Using an MX584 Reference

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Figure 17. MX7672 Ideal Unipolar Transfer Function

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