BF516F datasheet(52/68 Pages) AD

52 / 68 page

Rev. B

Page 52 of 68

January 2011

ADSP-BF512/BF512F, BF514/BF514F, BF516/BF516F, BF518/BF518F

TEST CONDITIONS

All timing parameters appearing in this data sheet were mea-

sured under the conditions described in this section. Figure 53

shows the measurement point for ac measurements (except out-

put enable/disable). The measurement point VMEAS is VDDEXT/2

or VDDMEM/2 for VDDEXT/VDDMEM (nominal) = 1.8 V/2.5 V/3.3 V.

Output Enable Time Measurement

Output signals 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 tENA 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

Figure 54.

The time tENA_MEASURED is the interval from when the reference

signal switches to when the output voltage reaches VTRIP(high)

or VTRIP(low). For VDDEXT (nominal) = 1.8 V, VTRIP (high) is

0.95 V, and VTRIP (low) is 0.85 V. For VDDEXT (nominal) = 2.5 V,

VTRIP (high) is 1.3 V and VTRIP (low) is 1.2 V. For VDDEXT (nomi-

nal) = 3.3 V, VTRIP (high) is 1.7 V, and VTRIP (low) is 1.6 V. Time

tTRIP is the interval from when the output starts driving to when

the output reaches the VTRIP(high) or VTRIP(low) trip voltage.

Time tENA is calculated as shown in the equation:

If multiple signals (such as the data bus) are enabled, the mea-

surement value is that of the first signal to start driving.

Figure 50. Driver Type E Current (3.3V VDDEXT/VDDMEM)

Figure 51. Driver Type E Current (2.5V VDDEXT/VDDMEM)

Figure 52. Driver Type E Current (1.8V VDDEXT/VDDMEM)

SOURCE VOLTAGE (V)

0.5

1.0

1.5

2.0

2.5

3.0

3.5

–60

–30

–10

VOL

DDEXT = 3.6V @ – 40°C

DDEXT = 3.3V @ 25°C

–20

–40

DDEXT = 3.0V @ 105°C

–50

3.0

3.5

SOURCE VOLTAGE (V)

0.5

1.0

1.5

2.0

2.5

–40

–30

–10

VOL

DDEXT = 2.75V @ – 40°C

DDEXT = 2.5V @ 25°C

–20

DDEXT = 2.25V @ 105°C

3.5

SOURCE VOLTAGE (V)

0.5

1.0

1.5

–20

–15

–5

VOL

DDEXT = 1.9V @ – 40°C

DDEXT = 1.8V @ 25°C

–10

DDEXT = 1.7V @ 105°C

3.0

2.5

2.0

Figure 53. Voltage Reference Levels for AC

Measurements (Except Output Enable/Disable)

Figure 54. Output Enable/Disable

INPUT

OUTPUT

VMEAS

REFERENCE

SIGNAL

tDIS

OUTPUT STARTS DRIVING

VOH (MEASURED) - ΔV

VOL (MEASURED) + ΔV

tDIS_MEASURED

VOH

(MEASURED)

VOL

(MEASURED)

VTRIP(HIGH)

VOH(MEASURED)

VOL(MEASURED)

HIGH IMPEDANCE STATE

OUTPUT STOPS DRIVING

tENA

tDECAY

tENA_MEASURED

tTRIP

VTRIP(LOW)

tENA

tENA_MEASURED tTRIP

–

BF516F Datasheet(PDF) 52 Page - Analog Devices

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