OPA688P datasheet(4/18 Pages) TI1

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OPA688

SBOS082A

OUTPUT VOLTAGE LIMITERS

Pins 5 and 8

Default Limiter Voltage

Limiter Pins Open

VCM ±0.9 VCM ±0.6 VCM ±0.6 VCM ±0.6

min

Minimum Limiter Separation (VH – VL)

200

min

Maximum Limit Voltage

—

VCM ±1.8 VCM ±1.8 VCM ±1.8

max

Limiter Input Bias Current Magnitude(5)

VO = 2.5V

Maximum

µA

max

Minimum

µA

min

Average Drift

——

nA/

°C

max

Limiter Input Impedance

2 || 1

———

Ω || pF

typ

Limiter Feedthrough(6)

f = 5MHz

–60

———

typ

DC Performance in Limit Mode

VIN = VCM ±1.2V

Limiter Voltage Accuracy

(VO – VH) or (VO – VL)

±15

±35

±40

max

Op Amp Bias Current Shift(3)

———

µA

typ

AC Performance in Limit Mode

Limiter Small Signal Bandwidth

VIN = VCM ±1.2V, VO < 0.02Vp-p

300

———

MHz

typ

Limiter Slew Rate(7)

———

µs

typ

Limited Step Response

2x Overdrive

Overshoot

VIN = VCM to VCM ±1.2V Step

———

typ

Recovery Time

VIN = VCM ±1.2V to VCM Step

———

max

Linearity Guardband(8)

f = 5MHz, VO = 2Vp-p

———

max

THERMAL CHARACTERISTICS

Temperature Range

Specification: P, U

–40 to +85

———

°C

typ

Thermal Resistance

Junction-to-Ambient

8-Pin SO-8

125

———

°C/W

typ

NOTES: (1) Junction Temperature = Ambient Temperature for low temperature limit and 25

°C guaranteed specifications. Junction Temperature = Ambient Temperature + 23°C

at high temperature limit guaranteed specifications. (2) TEST LEVELS: (A) 100% tested at 25

°C. Over temperature limits by characterization and simulation. (B) Limits set by

characterization and simulation. (C) Typical value for information only. (3) Current is considered positive out of node. (4) CMIR tested as < 3dB degradation from minimum

CMRR at specified limits. (5) IVH (VH bias current) is negative, and IVL (VL bias current) is positive, under these conditions. See Note 3, Figures 2, and Figure 8. (6) Limiter

feedthrough is the ratio of the output magnitude to the sinewave added to VH (or VL) when VIN = 0. (7) VH slew rate conditions are: VIN = VCM +0.4V, G = +2, VL = VCM –1.2V,

VH = step between VCM + 1.2V and VCM. VL slew rate conditions are similar. (8) Linearity Guardband is defined for an output sinusoid (f = 5MHz, VO = VCM ±1Vp-p) centered

between the limiter levels (VH and VL). It is the difference between the limiter level and the peak output voltage where SFDR decreases by 3dB (see Figure 9).

SPECIFICATIONS: VS = +5V (Cont.)

G = +2, RL = 500Ω tied to VCM = 2.5V, RF = 402Ω, VL = –1.2V, VH = +1.2V (Figure 2 for AC performance only), unless otherwise noted.

OPA688U

TYP

GUARANTEED(1)

°C to

–40

°C to

MIN/

TEST

PARAMETER

CONDITIONS

+25

°C

+25

°C

+70

°C

+85

°C

UNITS

MAX LEVEL(2)

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