ADMC300 datasheet(4/42 Pages) AD

4 / 42 page

–4–

REV. B

ADMC300–SPECIFICATIONS

ENCODER INTERFACE UNIT

Parameter

Test Conditions

Min

Typ

Max

Unit

fENC, MAX

Maximum Encoder Pulse Rate1

3.1

MHz

NOTES

1Assumes perfect quadrature encoder signals.

Specifications subject to change without notice.

AUXILIARY PWM OUTPUTS

Parameter

Test Conditions

Min

Typ

Max

Unit

Resolution

Bits

fAUXPWM

Switching Frequency

48.8

kHz

Specifications subject to change without notice.

(VDD = AVDD = 5 V

10%, GND = AGND = 0 V, TAMB = –40 C to +85 C, CLKIN = 12.5 MHz, unless

otherwise noted)

(VDD = AVDD = 5 V

10%, GND = AGND = 0 V, TAMB = –40 C to +85 C, CLKIN = 12.5 MHz, unless

otherwise noted)

TIMING PARAMETERS

Parameter

Min

Max

Unit

Clock Signals

tCK is defined as 0.5 tCKI. The ADMC300 uses an input clock with a frequency equal

to half the instruction rate; a 12.5 MHz input clock (which is equivalent to 80 ns)

yields a 40 ns processor cycle (equivalent to 25 MHz). tCK values within the range of

0.5 tCKI period should be substituted for all relevant timing parameters to obtain

specification value.

Example: tCKH = 0.5 tCK – 10 ns = 0.5 (40 ns) – 10 ns = 10 ns.

Timing Requirements:

tCKI

CLKIN Period

150

tCKIL

CLKIN Width Low

tCKIH

CLKIN Width High

Switching Characteristics:

tCKL

CLKOUT Width Low

0.5 tCK – 10

tCKH

CLKOUT Width High

0.5 tCK – 10

tCKOH

CLKIN High to CLKOUT High

Control Signals

Timing Requirement:

tRSP

RESET Width Low

5 tCK

PWM Shutdown Signals

Timing Requirements:

tPWMTPW

PWMTRIP Width Low

3 tCK

tPIOPWM

PIO Width Low

3 tCK

NOTES

1Applies after power-up sequence is complete. Internal phase lock loop requires no more than 2000 CLKIN cycles assuming stable CLKIN (not including crystal

oscillator start-up time).

Specifications subject to change without notice.

CLKIN

CLKOUT

tCKOH

tCKI

tCKIH

tCKH

tCKL

tCKIL

Figure 1. Clock Signals

ADMC300 Datasheet(PDF) 4 Page - Analog Devices

ADMC300 Datasheet(HTML) 4 Page - Analog Devices

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42

Datasheet Download

Link URL