U4459B Datasheet, PDF (2/7 Pages) TEMIC Semiconductors – IF Amplifier for Cable DVB Processing

U4459B
Pin Description
IF1_in 1
V_tun 2
I_{tun 3}
GND ₄
V_gain 5
IF2_out 6
NC ₇
LO_{in 8}
16 IF1_in
15 GND
14 ^VS
13 ^BG
12 NC
11 NC
10 ^NC
95 10696
Figure 2.
9 ^LOin
Pin Symbol
Function
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ₁
IF1_in IF1 input
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ₂
V_tun Take over point of tuner-AGC
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ₃
I_tun Tuner-AGC output current
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ 4
GND Ground
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ⁵
V_gain IF gain control input
6
IF2_out IF2 output
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ₇
NC Not connected
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ₈
LO_in Local oscillator input
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ₉
LO_in Local oscillator input
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ₁₀
NC Not connected
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ₁₁
NC Not connected
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ 12
NC Not connected
13
BG Bandgap reference
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ _{(internal use only)}
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ₁₄
VS Supply voltage
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ₁₅
GND Ground
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ₁₆
IF1_in IF1 input
Circuit Description
The U4459B consists of a controllable 3-stage wideband
amplifier, a mixer, IF-AGC and a tuner-AGC with
adjustable take over point. The IF1 input voltage is
applied at Pin 1 to 16 and it is fed via a 3-stage gain
controlled wideband amplifier to the mixer. The wide-
band amplifier with high linearity is gain controlled by
external dc voltage. The oscillator voltage (Pin 8–9) for
the mixer stage can be applied symmetrically as well as
unsymmetrically.
The mixed signal (2nd IF) is fed through a buffer
amplifier to the output Pin 6. The control voltage can also
be used for an additional external preamplifier in the
tuner. This tuner-AGC with adjustable take over point
protects the IF1 input against overload.
Absolute Maximum Ratings
ÁÁÁÁÁÁÁ^RSSPVJSÁ^{euÁÁÁÁÁÁuuotsfonppwe=rcppraet}Á^{eÁÁÁÁÁÁlligryy1noed3cnvcite.}Á^{uÁÁÁÁÁÁseo5tespmrlVmitropaep}Á^{igÁÁÁÁÁÁ}panneteetrtiraoPatÁ^{nÁÁÁÁÁÁ}_utiunrre4eÁÁÁÁÁÁÁ^{, unP}ÁÁÁÁÁÁÁ^leasrasÁÁÁÁÁÁÁ^motehtÁÁÁÁÁÁÁ^eerrswPPPÁÁÁÁÁÁÁ^{isiiinnne s111}ÁÁÁÁÁÁÁ^p444ecÁÁÁÁÁÁÁ^ifiedÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ^SyTVmTIÁÁÁÁÁÁÁ^P_sstjs^b_g^oÁÁÁÁÁÁÁ^l ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ_–25Á^{VÁÁÁÁÁÁ}+17ta51o35l52.u0+5ÁÁÁÁÁÁÁ5e125ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ^Umm°°ÁÁÁÁÁÁÁ^VnCCWAit ÁÁÁÁÁÁÁÁÁÁÁÁÁÁ
2 (7)
TELEFUNKEN Semiconductors
Rev. A1, 15-Jul-96