Instruction Manual

FC7785W
Dual-band (Low/High Band)CDMA
1x/EVDO Rev.A Diversity Transceiver
FCI Confidential and Proprietary Information 1 / 19 Last updated at Apr/08/2013
The data can be changed without prior notice.
Future
Communications
Integrated circuit Inc.
D
ESCRIPTION
FC7785W is a dual-band CDMA transceiver with
receiver diversity FCI’s zipRF™ family. The
FC7785W uses the same die with FC7785 with
different package type. The FC7785W covers BC0,
BC1, BC4, BC10, and BC14 band class. It is a
highly integrated chip working with a single power
supply. Because zero-IF architecture is used for
FC7785W, additional components such as bulky IF
SAW filters and other IF matching components are
no longer required. FC7785W is featured to operate
in the high data rate EVDO. Three-wired serial-to-
parallel interface (SPI) protocol enables FC7785W
to operate in the various modes. FC7785W
contains complete dual-band receiver’s main and
diversity path such as LNA, down-conversion mixer,
channel selection filter (CSF), Rx VCO, Rx PLL,
and LO distribution block. FC7785W also contains
complete dual-band transmitter path such as
baseband amplifier, up-converter, RF variable-gain
block, drive amplifier, Tx VCO, Tx PLL, and LO
distribution block. FC7785W is optimized to have
high SNR in 1x and EVDO Rev.A receive and
transmit mode. FC7785W is available in 4.87 x 4.79
mm WLCSP package. The max. height of the
package is 0.65mm.
A
PPLICATIONS
-
Dual-band CDMA 1x/EVDO Rev.A diversity
mobile phone or data card.
R
EVISION
H
ISTORY
-
Preliminary
version release: Jan, 20, 2012
-
Preliminary
version release: Apr, 10, 2012
-
Preliminary
version release: Apr, 08, 2013
F
EATURES

Single-chip dual-band (Low-band and High-band) receiver
diversity transceiver without need of external LNA

FC7785W covers band class of BC0, BC1, BC4, BC10, and
BC14.

Low noise and highly linear LNA, mixer, and CSF for
Low-band/High-band CDMA

Low noise, highly linear, wide dynamic range transmitter
with baseband amplifier, up-converter, drive amplifier

Automatic DC-offset calibration, filter calibration, VCO
calibration

Fully integrated low phase noise Rx, Tx, and Fractional-
N PLL with fine frequency resolution

Greater than 85-dB transmit power control

Support 3-wired SPI protocol

WLCSP package with dimension of 4.87 x 4.79 mm with
max. height of 0.65mm.
B
LOCK
D
IAGRAM
TX_RBIAS
TX_VC
TX_CDA_OUT
SPDT
SPCK
RX_VCO_FTUNE
SPST
TX_QP
TX_QM
TX_IP
TX_IM
TX VCO
& LO
TX PLL
TCXO BUFFER
TX
Control Part
RX_LOIO
TCXO
TX_ON
TX_CP_HOLD
RX PLL
TX_PDA_OUT
CDMA
SPI
TX_CP
TX_LOIO
RX1_PLNA_IN
RX1_CLNA_BIAS
RX1_CLNA_IN
RX1_IP
RX1_IM
RX1_QP
RX1_QM
RX1_PLNA_BIAS
RX1_CMIX_INM
RX1_CMIX_INP
RX1_PMIX_INM RX1_PMIX_INP
LOAD
CSF
CSF
RX
BIAS
RX_RBIAS
LOAD
CSF
CSF
RxVCO
& LO
RX2_PLNA_IN
RX2_CLNA_BIA
S
RX2_CLNA_IN
RX2_PLNA_BIA
S
RX2_IP
RX2_IM
RX2_QP
RX2_QM
RX2_PLNA_OUT RX2_CLNA_OUT RX2_CMIX_INM RX2_CMIX_INP RX2_PMIX_INM
RX2_PMIX_INP
LOCK
RX1_PLNA_OUT
RX1_CLNA_OUT
For latest specifications, technical questions and additional product information, visit website or e-mail
FCI Inc.
11
th
Floor, Kins Tower, 25-1 Website: http://www.fci.co.kr
Jeongja-Dong, Bundang-Gu, E-mail: [e-mail]
Sungnam City, Gyunggi-do, Phone: [phone]
463-811, KOREA Fax: [phone]