ADCDS-1405EX datasheet(6/9 Pages) MURATA

Part #	ADCDS-1405EX

Description	14-Bit, 5 Megapixels/Second Imaging Signal Processor

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Manufacturer	MURATA [Murata Manufacturing Co., Ltd.]

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ADCDS-1405

6

®®

Table 1. Out-of-Range Conditions

Table 2. Output Coding

OUT

OVER

UNDER

INPUT

OF RANGE

MSB

RANGE

SIGNAL

0

In Range

0

1

0

In Range

1

0

1

Underrrange

1

0

Overrange

Notes: ➀ Input Amplifier VOUT = (Video Signal - Reference Level)

➁ The video portion of the differential signal (input-amplifier's VOUT) must be more negative than its associated reference

level and VOUT should not exceed ±2.8V DC.

Video Signal-Reference Signal

> –2.80000

>Full Scale –1LSB

11 1111 1111 1111

1

–2.80000

Full Scale –1LSB

11 1111 1111 1111

0

–2.10000

3/4FS

11 0000 0000 0000

0

–1.40000

1/2FS

10 0000 0000 0000

0

–0.70000

1/4FS

01 0000 0000 0000

0

–0.35000

1/8FS

00 1000 0000 0000

0

–0.000171

1 LSB

00 0000 0000 0001

0

00 0000 0000 0000

0

Video Signal-Reference Signal

<0 ➁

<0

00 0000 0000 0000

1

INPUT AMPLIFIER VOUT, ➀

➀

(VOLTS P-P)

SCALE

DIGITAL OUTPUT

OUT-OF-RANGE

Output Coding

The ADCDS-1405's output coding is Straight Binary as

indicated in Table 2. The table shows the relationship between

the output data coding and the difference between the

reference signal voltage and its corresponding video signal

voltage. (These voltages are referred to the output of the

ADCDS-1405's input amplifier's VOUT).

Programmable Analog Bandwidth Function

When interfacing to CCD arrays with very high-speed "read-

out" rates, the ADCDS-1405's input stage must have sufficient

analog bandwidth to accurately reproduce the output signals

of the CCD array. The amount of analog bandwidth

determines how quickly and accurately the "Reference Hold"

and the "CDS output" signals will settle. If only a single analog

bandwidth was offered, the ADCDS-1405's bandwidth would

be set to acquire and digitize CCD output signals to 14-bit

accuracy, at maximum conversion rate of 5MHz (200ns see

Figure 11. for details). Applications not requiring the maximum

conversion rate would be forced to use the full analog

bandwidth at the possible expense of noise performance.

The ADCDS-1405 avoids this situation by offering a fully

programmable analog bandwidth function. The ADCDS-1405

allows the user to "bandwidth limit" the input stage in order to

realize the highest level of noise performance (DC noise of

0.3 LSBs rms possible) for the application being considered.

Table 3. describes how to select the appropriate reference

hold "aquisition time" and CDS output "settling time" needed

for a particular application. Each of the selections listed in

Table 3. have been optimized to provide only enough analog

bandwidth to acquire a full scale input step, to 14-bit accuracy,

in a single conversion. Increasing the analog bandwidth

(using a faster settling and acquisition time) would only serve

to potentially increase the amount of noise at the ADCDS-

1405's output. The ADCDS-1405 uses a two bit digital word to

select four different analog bandwidths for the ADCDS-1405's

input stage (See Table 3. for details).

MSB

OUT-OF-RANGE

"OVERRANGE"

"UNDERRANGE"

Figure 8. Overrange/ Underrange Circuit

to avoid interaction. The fine gain adjust provides ±256 codes

of adjust when ±5V supplies are used for the Fine Gain Adjust

Circuit.

Out-of-Range Indicator

The ADCDS-1405 provides a digital Out-of-Range output

signal (pin 24) for situations when the video input signal

(saturated signal) is beyond the input range of the internal A/D

converter. The digital output bits and the Out-of-Range signal

correspond to a particular sampled video input voltage, with

both of these signals having a common pipeline delay.

Using the circuit described in Figure 8., both overrange and

underrange conditions can be detected (see Table 1). When

combined with a D/A converter, digital detection and orrection

can be performed for both the gain and offset errors.

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