LTC6412
5
6412fa
AC ELECTRICAL CHARACTERISTICS
The l denotes specifi cations that apply over the full operating
temperature range, otherwise specifi cations are at T
A
= 25°C. Typical AC electrical performance measured in demo board DC1464A
(Figure 3, Test Circuit A) unless otherwise noted. Default operating conditions are V
CC
= 3.3V, EN = 0.8V, SHDN = 2.2V, +V
G
tied to V
REF
(negative gain slope mode), and Z
SOURCE
= Z
LOAD
= 50Ω unless otherwise noted.
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
Small Signal
BW
GMAX
–3dB Bandwidth for Sdd21 at Maximum Gain –V
G
= 0V, Test Circuit B 800 MHz
BW
GMIN
–3dB Bandwidth for Sdd21 at Minimum Gain –V
G
= 1.2V, Test Circuit B 800 MHz
Sdd11 Input Match at Z
SOURCE
= 50Ω Differential –V
G
= 0V to 1.2V, 10MHz-500MHz,
Test Circuit B
–20 dB
Sdd22 Output Match at Z
LOAD
= 200Ω Differential –V
G
= 0V to 1.2V, 10MHz-250MHz,
Test Circuit B
–10 dB
Sdd12 Reverse Isolation –V
G
= 0V to 1.2V, 10MHz-500MHz,
Test Circuit B
-80 dB
Transient Response
t
STEP(6dB)
6dB Gain Step Response Time Peak P
OUT
= +4dBm, –V
G
= 0.2V to 0.4V,
Time to Settle Within 1dB of Final P
OUT
0.4 μs
t
STEP(12dB)
12dB Gain Step Response Time Peak P
OUT
= +4dBm, –V
G
= 0.2V to 0.6V,
Time to Settle Within 1dB of Final P
OUT
0.4 μs
t
STEP(20dB)
20dB Gain Step Response Time Peak P
OUT
= +4dBm, –V
G
= 0.2V to 0.8V,
Time to Settle Within 1dB of Final P
OUT
0.4 μs
t
OVDR
Overdrive Recovery Time at 70MHz –V
G
= 0V, P
IN
= +3dBm to –17dBm, Time to
Settle Within 1dB of Final P
OUT
25 ns
t
OFF
Output Amplifi er Disable Time P
OUT
= 0dBm at EN = 0V, –V
G
= 0V,
EN = 0V to 3V, Time for P
OUT
≤ –20dBm
25 ns
t
ON
Output Amplifi er Enable Time P
OUT
= 0dBm at EN = 0V, –V
G
= 0V, EN = 3V to
0V, Time for P
OUT
≥ –1dBm
20 ns
70MHz Signal
G
MAX
Maximum Gain –V
G
= 0V, Test Circuit B 17 dB
G
MIN
Minimum Gain –V
G
= 1.2V, Test Circuit B –15 dB
G
RANGE
Gain Range G
MAX
-G
MIN
32 dB
HD2 Second Harmonic Distortion P
OUT
= 0dBm, –V
G
= 0V to 1.0V –80 dBc
HD3 Third Harmonic Distortion P
OUT
= 0dBm, –V
G
= 0V to 1.0V –80 dBc
IM3 Third-Order Intermodulation f
1
= 69.5MHz, f
2
= 70.5MHz,
P
OUT
= –6dBm/Tone, –V
G
= 0V to 1.0V
–90 dBc
OIP3 Output Third-Order Intercept f
1
= 69.5MHz, f
2
= 70.5MHz,
P
OUT
= –6dBm/Tone, –V
G
= 0V to 1.0V
39 dBm
P1dB
GMAX
Output 1dB Compression Point at Max Gain –V
G
= 0V (Note 6) 13 dBm
NF
GMAX
Noise Figure at Maximum Gain –V
G
= 0V (Note 5) 10 dB
NF
GMIN
Noise Figure at Minimum Gain –V
G
= 1.2V (Note 5) 42 dB
140MHz Signal
G
MAX
Maximum Gain –V
G
= 0V, Test Circuit B 17 dB
G
MIN
Minimum Gain –V
G
= 1.2V, Test Circuit B –15 dB
G
RANGE
Gain Range G
MAX
-G
MIN
32 dB
HD2 Second Harmonic Distortion P
OUT
= 0dBm, –V
G
= 0V to 1.0V –80 dBc
HD3 Third Harmonic Distortion P
OUT
= 0dBm, –V
G
= 0V to 1.0V –75 dBc
