TCM4300 Datasheet, PDF (37/69 Pages) Texas Instruments – Advanced RF Cellular Telephone Interface Circuit (ARCTIC )

Table 4–2. RXIP, RXIN, RXQP, and RXQN Inputs (AV_DD = 3 V, 4.5 V, 5 V)
PARAMETER
TEST CONDITIONS
MIN TYP MAX
UNIT
Input voltage range
Input voltage for full- scale
digital output
Differential
Single ended
0.3
AVDD– 0.3
V
0.5
Vp-p
0.5
Nominal operating level
Differential
Single ended
0.125
0.125
Vp-p^†
Input CMRR (RXI, RXQ)
45
dB
Sampling frequency, SINT (digital mode)
48.6
kHz
Sampling frequency, SINT (analog mode)
40
kHz
Receive error vector magnitude (EVM)
5%
6%
I/Q sample timing skew
Input signal 0 – 15 kHz
50
ns
A / D resolution
10
Bits
Signal-to-noise plus distortion
Input at full scale – 1 dB
54
58
dB
Integral nonlinearity
0 dB to – 60 dB input
1
LSB
Gain error (I or Q channel)
Gain mismatch between I and Q
Differential dc offset voltage
FM input sensitivity, for full scale (± 14-kHz
deviation)
± 7%
± 0.3
± 30
2.5
dB
mV
Vp-p
FM input dc offset (relative to VHR)
± 80
mV
FM input idle channel noise, below full scale
input
– 50
dB
FM gain error
± 6%
Power supply rejection
f = 0 kHz to 15 kHz
† _{Provides 12-dB headroom for AGC fading conditions.}
40
dB
It is recommended that the single-ended output of an external FM discriminator be capacitively coupled to
the FM terminal for analog mode voice and WBD reception. An external bias resistor is needed to bias the
FM terminal to VHR. The signal at this terminal is conveyed to the Q side of the receiver using the multiplexer,
and the other Q input is connected internally to the VHR reference voltage. The I input of the receive section
circuitry is disabled in the analog mode. The FM signal passes through the antialiasing filter, as specified
in Table 4–3, before passing through the A/D converter. The signal at the FM terminal is also routed directly
to the WBD demodulator through a low-pass filter (LPF) with the – 3 dB point at 270 kHz.
4–2