Analog Devices ADSP-TS201S Impedance Control Selection, Drive Strength/Output Impedance Selection

ADSP-TS201S

Table 13. Impedance Control Selection

CONTROLIMP1-0		Driver Mode
00	(recommended)	Normal
01		Reserved
10	(default)	A/D Mode
11		Reserved

Table 14. Drive Strength/Output Impedance Selection

DS2–0	Drive	Output
Pins	Strength1	Impedance 2
000	Strength 0 (11.1%)	26 Ω
001	Strength 1 (23.8%)	32 Ω
010	Strength 2 (36.5%)	40 Ω
011	Strength 3 (49.2%)	50 Ω
100	Strength 4 (61.9%)	62 Ω
101 (default)	Strength 5 (74.6%)	70 Ω
110	Strength 6 (87.3%)	96 Ω
111	Strength 7 (100%)	120 Ω

1CONTROLIMP1 = 0, A/D mode disabled.

2 CONTROLIMP1 = 1, A/D mode enabled.

Table 15. Pin Definitions—Power, Ground, and Reference

Signal	Type	Term		Description
VDD	P	na		VDD pins for internal logic.
VDD_A	P	na		VDD pins for analog circuits. Pay critical attention to bypassing this supply.
VDD_IO	P	na		VDD pins for I/O buffers.
VDD_DRAM	P	na		VDD pins for internal DRAM.
VREF	I	na		Reference voltage defines the trip point for all input buffers, except SCLK,
											RST_IN,
				POR_IN,	IRQ3–0,	FLAG3–0,	DMAR3–0,	ID2–0, CONTROLIMP1–0, LxDATO3–0P/N,
				LxCLKOUTP/N, LxDATI3–0P/N, LxCLKINP/N, TCK, TDI, TMS, and					TRST.	VREF can be
				connected to a power supply or set by a voltage divider circuit as shown in Figure 6.
				For more information, see Filtering Reference Voltage and Clocks on Page 10.
SCLK_VREF	I	na	System Clock Reference. Connect this pin to a reference voltage as shown in Figure 7.
				For more information, see Filtering Reference Voltage and Clocks on Page 10.
VSS	G	na		Ground pins.
NC	—	nc		No Connect. Do not connect these pins to anything (not to any supply, signal, or each
				other). These pins are reserved and must be left unconnected.

I = input; A = asynchronous; O = output; OD = open-drain output; T = three-state; P = power supply; G = ground; pd = internal pull-down

5kΩ; pu = internal pull-up 5 kΩ; pd_0 = internal pull-down 5 kΩ on DSP ID = 0; pu_0 = internal pull-up 5 kΩ on DSP ID = 0; pu_od_0 = internal pull-up 500 Ω on DSP ID = 0; pd_m = internal pull-down 5 kΩ on DSP bus master; pu_m = internal pull-up 5 kΩ on DSP bus master; pu_ad = internal pull-up 40 kΩ. For more pull-down and pull-up information, see Electrical Characteristics on Page 22.

Term (termination of unused pins) column symbols: epd = external pull-down approximately 5 kΩ to VSS; epu = external pull-up approx- imately 5 kΩ to VDD_IO, nc = not connected; na = not applicable (always used); VDD_IO = connect directly to VDD_IO; VSS = connect directly to VSS

Rev. C Page 19 of 48 December 2006