ISL23445 Datasheet, PDF (8/20 Pages) Intersil Corporation – Quad, 256 Tap, Low Voltage Digitally Controlled Potentiometer (XDCP™)

ISL23445
Serial Interface Specification For SCK, SDI, SDO, CS Unless Otherwise Noted. (Continued)
SYMBOL
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
(Note 20) (Note 8) (Note 20) UNITS
t_CS
CS Deselect Time
2
µs
NOTES:
8. Typical values are for T_A = +25°C and 3.3V supply voltages.
9. LSB = [V(RW)₂₅₅ – V(RW)₀]/255. V(RW)₂₅₅ and V(RW)₀ are V(RW) for the DCP register set to FF hex and 00 hex respectively. LSB is the incremental
voltage when changing from one tap to an adjacent tap.
10. ZS error = V(RW)₀/LSB.
11. FS error = [V(RW)₂₅₅ – V_CC]/LSB.
12. DNL = [V(RW)_i – V(RW)_i-1]/LSB-1, for i = 1 to 255. i is the DCP register setting.
13. INL = [V(RW)_i – i • LSB – V(RW)₀]/LSB for i = 1 to 255
14.
TC_V
=
M_------a_---x_----(_--V_----(_--R_----W_------)_--i--)_{----–----}M_-----i_--n_----(_---V_---(_---R_----W_------)_--i--)
V ( R W_i ( + 25 °C ) )
×
------¹----⁰----⁶-------
+ 165 °C
for i = 16 to 255 decimal, T = -40°C to +125°C. Max( ) is the maximum value of the wiper
voltage and Min( ) is the minimum value of the wiper voltage over the temperature range.
15. MI = |RW₂₅₅ – RW₀|/255. MI is a minimum increment. RW₂₅₅ and RW₀ are the measured resistances for the DCP register set to FF hex and 00
hex respectively.
16. Roffset = RW₀/MI, when measuring between RW and RL.
Roffset = RW₂₅₅/MI, when measuring between RW and RH.
17. RDNL = (RW_i – RW_i-1)/MI -1, for i = 16 to 255.
18. RINL = [RW_i – (MI • i) – RW₀]/MI, for i = 16 to 255.
19.
TC_R =
-^[--^M-----^a----^x-_R--⁽--^R-_i--₍--ⁱ⁺--⁾--₂-–--₅---^M-_°----^iC--ⁿ--₎--⁽--^R----ⁱ--⁾---^]
×
------¹----⁰----⁶-------
+ 165 °C
for i = 16 to 255, T = -40°C to +125°C. Max( ) is the maximum value of the resistance and Min( ) is the
minimum value of the resistance over the temperature range.
20. Compliance to datasheet limits is assured by one or more methods: production test, characterization and/or design.
21. It is preferable to ramp up both the V_LOGIC and the V_CC supplies at the same time. If this is not possible, it is recommended to ramp-up the V_LOGIC
first followed by the V_CC.
22. VMATCH = [V(RWx)i - V(RWy)i]/LSB, for i = 1 to 255, x = 0 to 3 and y = 0 to 3.
23. RMATCH = (RWi,x - RWi,y)/MI, for i = 1 to 255 , x = 0 to 3 and y = 0 to 3.
8
FN7874.0
June 21, 2011