ADZS-BF527-EZLITE【PDF 75/88 页】BOARD EVAL ADSP-BF527

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ADSP-BF522/ADSP-BF523/ADSP-BF524/ADSP-BF525/ADSP-BF526/ADSP-BF527

60

TEST CONDITIONS

50

40

30

20

10

0

–10

–20

V DDEXT = 3.6V @ – 40 °C

V DDEXT = 3.3V @ 25 °C

V DDEXT = 3.0V @ 105 °C

All Timing Requirements appearing in this data sheet were

measured under the conditions described in this section.

Figure 58 shows the measurement point for AC measurements

(except output enable/disable). The measurement point V MEAS is

V DDEXT /2 or V DDMEM /2 for V DDEXT /V DDMEM (nominal) = 1.8 V/

2.5 V/3.3 V.

–30

–40

V OL

INPUT

OR

OUTPUT

V MEAS

V MEAS

–50

–60

0

0.5

1.0

1.5 2.0 2.5

SOURCE VOLTAGE (V)

3.0

3.5

Figure 58. Voltage Reference Levels for AC Measurements

(Except Output Enable/Disable)

Figure 55. Driver Type E Current (3.3V V DDEXT /V DDMEM )

Output Enable Time Measurement

40

30

20

10

0

–10

–20

V DDEXT = 2.75V @ – 40 °C

V DDEXT = 2.5V @ 25 °C

V DDEXT = 2.25V @ 105 °C

V OL

Output balls are considered to be enabled when they have made

a transition from a high impedance state to the point when they

start driving.

The output enable time t ENA is the interval from the point when

a reference signal reaches a high or low voltage level to the point

when the output starts driving as shown on the right side of

REFERENCE

SIGNAL

–30

–40

t DIS

t DIS_MEASURED

t ENA

t ENA_MEASURED

0

0.5

1.0

1.5 2.0 2.5

SOURCE VOLTAGE (V)

3.0

3.5

V OH

(MEASURED)

V OH (MEASURED)

V

V OH (MEASURED)

V TRIP (HIGH)

Figure 56. Driver Type E Current (2.5V V DDEXT /V DDMEM )

V OL

V OL (MEASURED) +

V

V TRIP (LOW)

V OL (MEASURED)

(MEASURED)

20

V DDEXT = 1.9V @ – 40 °C

t DECAY

t TRIP

15

10

V DDEXT = 1.8V @ 25 °C

V DDEXT = 1.7V @ 105 °C

OUTPUT STOPS DRIVING

OUTPUT STARTS DRIVING

HIGH IMPEDANCE STATE

5

0

Figure 59. Output Enable/Disable

The time t ENA_MEASURED is the interval from when the reference

–5

–10

–15

–20

V OL

signal switches to when the output voltage reaches V TRIP (high)

or V TRIP (low). For V DDEXT /V DDMEM (nominal) = 1.8 V, V TRIP

(high) is 1.05 V, and V TRIP (low) is 0.75 V. For V DDEXT /V DDMEM

(nominal) = 2.5 V, V TRIP (high) is 1.5 V and V TRIP (low) is 1.0 V.

For V DDEXT /V DDMEM (nominal) = 3.3 V, V TRIP (high) is 1.9 V, and

V TRIP (low) is 1.4 V. Time t TRIP is the interval from when the out-

0

0.5

1.0

1.5

2.0

2.5

3.0

3.5

put starts driving to when the output reaches the V TRIP (high) or

SOURCE VOLTAGE (V)

Figure 57. Driver Type E Current (1.8V V DDEXT /V DDMEM )

Rev. D |

V TRIP (low) trip voltage.

Time t ENA is calculated as shown in the equation:

t ENA = t ENA_MEASURED – t TRIP

If multiple balls (such as the data bus) are enabled, the measure-

ment value is that of the first ball to start driving.

Page 75 of 88 | July 2013

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