Ordering Information

Package

16-Pin LLP

Part Number

LMH6555SQ

LMH6555SQX

Package Marking

L6555SQ

Transport Media

1k Units Tape and Reel

4.5k Units Tape and Reel

NSC Drawing

SQA16A

Definition of Terms and Specifications (Alphabetical order)

Unless otherwise specified, VCM_REF = 1.2V

1. 1. AV_CM (dB)

Change in the output common mode voltage (ΔVO_CM ) with respect to the change in input

common mode voltage (ΔVI_CM)

2. AV_DIFF (dB)

Insertion gain from a single ended 50Ω (or 100Ω differential) source to the differential output

(ΔVOUT)

3. ΔAV_DIFF (dB)

Variation in insertion gain (AV_DIFF) with input signal change (ΔVIN )

4. AV_VAR (dB)

Variation of insertion gain (AV_DIFF) with VCM_REF input change (ΔVCM_REF). Calculated as the

change in AV_DIFF (dB) at various VCM_REF

5. CMVR (V)

Range of input common mode voltage (VI_CM) where the insertion gain (AV_DIFF) is 30 dB larger

than common mode gain (AV_CM) and hence the amplifier’s output is dominated by its

differential output

6. Gain_VCM_REF (V/V)

7. Pin (dBm referenced to

Variation in output common mode voltage (ΔVO_CM) with respect to change in VCM_REF input

(ΔVCM_REF) with maximum differential output

Input power associated with each of the tones for OIM3 testing

50Ω)

8. PSRR (dB)

Differential output change (ΔVOUT) with respect to the power supply voltage change (ΔVS) with

nominal differential output

9. PSRR_CM (dB)

10. RIN (Ω)

11. RIN_DIFF (Ω)

12. RL (Ω)

13. RO (Ω)

14. RS1, RS2 (Ω)

15. RT1, RT2 (Ω)

16. VCM_REF (V)

17. ΔVCM_REF (V)

18. VI_CM (V)

Output common mode voltage change (ΔVO_CM) with respect to the change in the power

supply voltage (ΔVS)

Single ended input impedance to ground

Differential input impedance

Differential output load

Equivalent to RT1 & RT2

Source impedance to VIN+ and VIN− respectively

Output impedance looking into each output

Device input pin voltage which controls output common mode

Change in the VCM_REF input voltage

DC average of the inputs (VIN+, VIN−)

19. ΔVI_CM (V)

20. VIN+, VIN− (V)

21. ΔVIN (V)

22. VO_CM (V)

23. ΔVO_CM (V)

24.

25.

Variation in input common mode voltage (VI_CM)

Device input pin voltages

Terminated (50Ω for single ended and 100Ω for differential) generator voltage

Output common mode voltage (DC average of VOUT+ and VOUT−)

Variation in output common mode voltage (VO_CM)

Balance Error. Measure of the output swing balance of VOUT+ and VOUT−, as reflected on the

output common mode voltage (VO_CM), relative to the differential output swing (VOUT).

Calculated as output common mode voltage change (ΔVO_CM) divided into the output

differential voltage change (ΔVOUT)

26. VOOS (V)

AC version of the DC balance error

test

DC Offset Voltage. Differential output voltage measured with both inputs grounded through

50Ω

www.national.com

4