LMH6518 Datasheet, PDF (5/8 Pages) National Semiconductor (TI) – 825 MHz, Digital Controlled, Variable Gain Amplifier

Definition of Terms and Specifications
1. CMRR (dB)
2. CM
3. ΔV_{O_CM}
4. ΔV_OUT
5. Voos
6. ΔV_IN (V)
7.
8. Out P
9. Out N
10. Out PA
11. Out NA
12. PSRR
13. PSRR_CM
14. HG
15. LG
16. Ladder
17. Min Gain
18. Max Gain
Differential Gain – CM Gain (from input to output).
Common Mode
Variation in output common mode voltage (V_{O_CM}).
Change in differential output voltage (Corrected for DC offset (Voos)).
DC offset voltage. Differential output voltage measured with inputs shorted together to
V_CC/2.
Differential voltage across device inputs.
Balance Error. Measure of the output swing balance of “out P” and “out N”, as reflected
on the output common mode voltage (V_{O_CM}), relative to the differential output swing
(V_OUT). Calculated as output common mode voltage change (ΔV_{O_CM}) divided by the
output differential voltage change (ΔV_OUT, which is nominally around 700 mV_PP).
Positive Main Output
Negative Main Output
Positive Auxiliary Output
Negative Auxiliary Output
Differential output change (ΔV_OUT) with respect to V_CC voltage change (ΔV_CC) with
nominal differential output.
Output common mode voltage change (ΔV_{O_CM}) with respect to V_CC voltage change
(ΔV_CC).
Preamp High Gain
Preamp Low Gain
Ladder Attenuator setting (0-20 dB
Gain = −1.16 dB
Gain = 38.84 dB
Note 1: Gain Step Size with ADC: With the National Semiconductor GigaSample/second ADC Full Scale (FS) adjustment (512 steps from 0.56V to 0.84V), the
worst case gain step size would be:
Note 2: “Recovery time” is the slower of the Main and Auxiliary outputs. Measured values correspond to time it takes to return to zero.
Note 3: ”Full Power” setting is with Auxiliary output turned on.
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