ISL23428_15 Datasheet, PDF (8/21 Pages) Intersil Corporation – Dual, 128-Tap, Low Voltage Digitally Controlled Potentiometer (XDCP™)

ISL23428
Serial Interface Specification For SCK, SDI, SDO, CS Unless Otherwise Noted. (Continued)
SYMBOL
PARAMETER
TEST CONDITIONS
MIN
(Note 19)
TYP
(Note 7)
MAX
(Note 19)
UNITS
t_RO
SDO Output Rise Time
R_pu = 1.5k, Cbus = 30pF
60
ns
t_FO
SDO Output Fall Time
R_pu = 1.5k, Cbus = 30pF
60
ns
t_CS
CS Deselect Time
2
µs
NOTES:
7. Typical values are for T_A = +25°C and 3.3V supply voltages.
8. LSB = [V(RW)₁₂₇ – V(RW)₀]/127. V(RW)₁₂₇ and V(RW)₀ are V(RW) for the DCP register set to 7F hex and 00 hex respectively. LSB is the incremental
voltage when changing from one tap to an adjacent tap.
9. ZS error = V(RW)₀/LSB.
10. FS error = [V(RW)₁₂₇ – V_CC]/LSB.
11. DNL = [V(RW)_i – V(RW)_i-1]/LSB-1, for i = 1 to 127. i is the DCP register setting.
12. INL = [V(RW)_i – i • LSB – V(RW)₀]/LSB for i = 1 to 127
13.
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 = 8 to 127decimal, 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.
14. MI = |RW₁₂₇ – RW₀|/127. MI is a minimum increment. RW₁₂₇ and RW₀ are the measured resistances for the DCP register set to 7F hex and 00
hex respectively.
15. Roffset = RW₀/MI, when measuring between RW and RL.
Roffset = RW₁₂₇/MI, when measuring between RW and RH.
16. RDNL = (RW_i – RW_i-1)/MI -1, for i = 8 to 127.
17. RINL = [RW_i – (MI • i) – RW₀]/MI, for i = 8 to 127.
18.
TC_R
=
-^--^M-----^a----^x---^--^R-----ⁱ--^---–-----^M-----ⁱ--ⁿ----^--^R----ⁱ--^---^
R i  + 25 °C 

------¹----⁰----⁶-------
+ 165 °C
for i = 8 to 127, 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.
19. Compliance to datasheet limits is assured by one or more methods: production test, characterization and/or design.
20. 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.
21. VMATCH = [V(RWx)i - V(RWy)i]/LSB, for i = 1 to 127, x = 0 to 1 and y = 0 to 1.
22. RMATCH = (RWi,x - RWi,y)/MI, for i = 1 to 127, x = 0 to 1 and y = 0 to 1.
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8
FN7904.2
September 23, 2015