Output Drive Currents

Figure 15 through Figure 22 show typical I–V characteristics for the output drivers of the ADSP-TS101S. The curves in these diagrams represent the current drive capability of the output drivers as a function of output voltage over the range of drive strengths.

STRENGTH 0

	30
	25	IOL
	20	IOL
	20
	15					VDD_IO = 3.45V, –40°C
–mA	10			VDD_IO = 3.3V, +25°C
–mA	5
CURRENT	5					VDD_IO = 3.45V, –40°C
	0	VDD_IO = 3.15V, +85°C				VDD_IO = 3.45V, –40°C
	0	VDD_IO = 3.15V, +85°C
	–5			VDD_IO = 3.3V, +25°C
)
IO	–10	VDD_IO = 3.15V, +85°C
DD	–10	VDD_IO = 3.15V, +85°C
DD
(V	–15
SOURCE	–20						IOH
	–25						IOH
	–25
	–30
	0	0.5	1.0	1.5	2.0	2.5	3.0	3.5
			SOURCE (VDD_IO) VOLTAGE – V

Figure 15. Typical Drive Currents at Strength 0

STRENGTH 1

	60
	50		IOL
mA	40
mA	30							VDD_IO = 3.45V, –40°C
–						VDD_IO = 3.3V, +25°C
CURRENT	20					VDD_IO = 3.3V, +25°C
	10							VDD_IO = 3.45V, –40°C
	0		VDD_IO = 3.15V, +85°C					VDD_IO = 3.45V, –40°C
	0		VDD_IO = 3.15V, +85°C
)
IO	–10					VDD_IO = 3.3V, +25°C
DD	–20
(V	–20	V	DD_IO	= 3.15V, +85°C
SOURCE			DD_IO
	–30
	–40
	–50								IOH
	–50								IOH
	–60
	–70	0		0.5	1.0	1.5	2.0	2.5	3.0	3.5
		0		0.5	1.0	1.5	2.0	2.5	3.0	3.5
					SOURCE (VDD_IO) VOLTAGE – V

Figure 16. Typical Drive Currents at Strength 1

Power Dissipation

Total power dissipation has two components, one due to internal circuitry (IDD) and one due to the switching of external output drivers (IDD_IO).

For details on internal and external power calculation issues including: power vector definitions, current usage descriptions, and formulas, see the EE-169: Estimating Power for the ADSPTS101S on the Analog Devices website—use site search on “EE169” (www.analog.com). This document is updated regularly to keep pace with silicon revisions.

STRENGTH 2

IOL

	60
mA	40						VDD_IO = 3.45V, –40°C
mA	40
–				VDD_IO = 3.3V, +25°C
NT				VDD_IO = 3.3V, +25°C
NT	20
RRE	20
RRE	0	VDD_IO = 3.15V, +85°C					VDD_IO = 3.45V, –40°C
CU	0	VDD_IO = 3.15V, +85°C
CU
)
IO	–20			V	DD_IO	= 3.3V, +25°C
D	–20				DD_IO
D
(V	–40	VDD_IO = 3.15V, +85°C
CE	–40	VDD_IO = 3.15V, +85°C
CE
OUR	–60
S
	–80							IOH
	–100
	0	0.5	1.0	1.5		2.0	2.5	3.0	3.5
			SOURCE (VDD_IO) VOLTAGE – V

Figure 17. Typical Drive Currents at Strength 2

STRENGTH 3

	125
	100		IOL
mA	75
mA							VDD_IO = 3.45V, –40°C
–	50
T
T
N					VDD_IO = 3.3V, +25°C
N
RE
RE	25
UR	25						VDD_IO = 3.45V, –40°C
UR
C)	0	V	DD_IO	= 3.15V, +85°C
C)		V		= 3.15V, +85°C
O
DDI	–25				VDD_IO = 3.3V, +25°C
CE(V	–50	VDD_IO = 3.15V, +85°C
OUR	–50
OUR	–75
S	–75
	–100							IOH
	–125
	0		0.5	1.0	1.5	2.0	2.5	3.0	3.5
				SOURCE (VDD_IO) VOLTAGE – V

Figure 18. Typical Drive Currents at Strength 3

STRENGTH 4

	140
	120	IOL
	100
mA	80					VDD_IO = 3.45V, –40°C
mA	60					VDD_IO = 3.45V, –40°C
T–	60			VDD_IO = 3.3V, +25°C
T–				VDD_IO = 3.3V, +25°C
N	40
RRE	40
RRE	20					VDD_IO = 3.45V, –40°C
CU	0	VDD_IO = 3.15V, +85°C				VDD_IO = 3.45V, –40°C
CU	0	VDD_IO = 3.15V, +85°C
)
OI	–20			VDD_IO = 3.3V, +25°C
D_	–20
D_	–40
D
E(V
E(V	–60	VDD_IO = 3.15V, +85°C
RC	–80
OU	–80
OU	–100
S	–100
	–120						IOH
	–140
	–160
	0	0.5	1.0	1.5	2.0	2.5	3.0	3.5
			SOURCE (VDD_IO) VOLTAGE – V

Figure 19. Typical Drive Currents at Strength 4

–28–

REV. 0

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