ISL21400 Datasheet, PDF (7/17 Pages) Intersil Corporation – Programmable Temperature Slope Voltage Reference

ISL21400
3. This parameter is not 100% tested.
4. Cb = total capacitance of one bus line in pF.
5. t_WC is the time from a valid stop condition at the end of a write sequence to the end of the self-timed internal nonvolatile write cycle. It is the
minimum cycle time to be allowed for any nonvolatile write by the user.
6. Over the specified temperature range. Temperature slope (TS) is measured by the box method whereby the change in V_OUT is divided by the
temperature range; in this case, -40°C to +85°C = +125°C. TS₁, TS₂, TS₃ =.
TS
=
-^V----^O----^U----^T----⁽---^T----^m-----ⁱ--ⁿ----⁾---–-----^V----^O----^U-----^T---⁽---^T----^m-----^a----^x----⁾
Tmin – Tmax
7. Given by PSRR (dB) = 20 * log₁₀ (ΔVout/ΔV_CC) at DC.
8. Test +25°C and +85°C only.
9. Total error of Equation 1 @ A_V =1, K = -2.1mV/°C, V_REF = 1.20V, m = 255, n = 255 to 0, V_CC = 3.0V
V_OUT(TE) = -^V----^O----^U----^T----⁽---^m-----^e----^aV----^s_O---^u--_U--^r--_T^e----₍^d--_E--⁾---_q^–---_u--^V--_a--^O--_t--_i-^U-_o---^T-_n--⁽--₁-^E--₎--^q----^u----^a----^t--ⁱ--^o----ⁿ---¹----⁾x100%
10. Over the specified temperature range. Temperature slope (TS) is measured by the box method whereby the change in V_OUT is divided by the
temperature range. Incremental TS is the temperature slope at m = 255 minus the temperature slope at m = 0 divided by 255 with A_V = 1, n = 255
TS4 =
⎛
⎜
⎝
V_{-----O----U----T----}(_---T_----m_-----i_--n_----)_{---–-----}V_{----O----U-----T---}(_---T_----m_-----a_----x_----)
(Tmin – Tmax)
m
=
⎞
⎟
255^⎠
–
⎛
⎜
⎝
V_{-----O----U----T----}(_---T_----m_-----i_--n_----)_{---–-----}V_{----O----U-----T---}(_---T_----m_-----a_----x_----)
(Tmin – Tmax)
m
=
⎞
⎟
0^⎠
÷ 255
11. Temperature Slope Non- linearity is measured over the specified temperature range. The actual change in output voltage is subtracted from the
expected change in output voltage, and then divided by the expected change to normalize before converting to percent.
TSNL = -⁽--^T-----^S----^y---⁽--_T^Δ----_ST----_y-⁾--⁾-_×---–--_Δ--^Δ--_T--^V-----^O-----^U-----^T-- x100%; y = 1, 2, 3
12. For codes n = 8 to 255
13. Guaranteed monotonic
14. t_WC is the time from a valid STOP condition at the end of a Write sequence of I²C serial interface, to the end of the self-timed internal nonvolatile
write cycle.
15. θ_JA is measured with the component mounted on a high effective thermal conductivity test board in free air. See Tech Brief TB379 for details.
Typical Performance Curves
3.0
A_V = 2
2.5
2.0
TS = 0
1.5
1.0
TS = 0
0.5
TS = 127
A_V = 1
TS = 255
TS = 255 _{TS = 127}
0.0
-40
-15
10
35
60
85
TEMPERATURE (°C)
FIGURE 1. V_OUT vs TEMPERATURE (A_V = 1, 2)
6.0
A_V = 4
5.5
5.0
4.5
TS = 127
TS = 255
4.0
TS = 0
3.5
3.0-40
-15
10
35
60
85
TEMPERATURE (°C)
FIGURE 2. V_OUT vs TEMPERATURE (A_V = 4)
7
FN8091.0
December 14, 2006