PSoC1 ADC10 maximum sample rate

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shma_1538871
Level 4
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25 replies posted 25 sign-ins 10 replies posted

I'd like to know maximum sample rate of ADC10.

Device is CY8C21123-24SXIT.

Current Data sheet mentions how to calculate sample rate.

But there is no maximum spec.

I can see maximum spec is 7.35 Ksps in old data sheet.

Please tell me maximum sample rate of ADC10.

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SampathS_11
Moderator
Moderator
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250 sign-ins 250 solutions authored 5 questions asked

Hello Matsushita-san,

The ADC10 can run at 7.35ksps under the following conditions:

Sysclk = 24MHz

Cpuclock = 24MHz

VC1 = 1

VC2 = 3

VC3 Source = VC2

VC3 Divider = 64

Dataclock = VC2

PWMH = 16 VC3 Period

PWML = 1 VC3 Period

Sampling Rate = 7.35ksps

Maximum sampling rate of 7.35ksps is possible only at 5V operation. At 3.3V and 2.7V as the CPU speed is less, the PWM low period is not sufficient for ADC calculation. So the PWM low period is increased and as a result the sampling rate comes down to 6.94ksps and 4.26ksps respectively.

Sampath

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SampathS_11
Moderator
Moderator
Moderator
250 sign-ins 250 solutions authored 5 questions asked

Hello Matsushita-san,

The ADC10 can run at 7.35ksps under the following conditions:

Sysclk = 24MHz

Cpuclock = 24MHz

VC1 = 1

VC2 = 3

VC3 Source = VC2

VC3 Divider = 64

Dataclock = VC2

PWMH = 16 VC3 Period

PWML = 1 VC3 Period

Sampling Rate = 7.35ksps

Maximum sampling rate of 7.35ksps is possible only at 5V operation. At 3.3V and 2.7V as the CPU speed is less, the PWM low period is not sufficient for ADC calculation. So the PWM low period is increased and as a result the sampling rate comes down to 6.94ksps and 4.26ksps respectively.

Sampath

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