Texas Instruments TCM4300 manual ±2. RXIP, RXIN, RXQP, and Rxqn Inputs Avdd = 3 V, 4.5 V, 5

Table 4±2. RXIP, RXIN, RXQP, and RXQN Inputs (AVDD = 3 V, 4.5 V, 5 V)

PARAMETER		TEST CONDITIONS	MIN	TYP	MAX	UNIT
Input voltage range			0.3		AVDD± 0.3	V
Input voltage for full- scale	Differential			0.5		Vp-p
digital output	Single ended			0.5
Nominal operating level	Differential			0.125		Vp-p²
	Single ended			0.125
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)					± 7%
Gain mismatch between I and Q					± 0.3	dB
Differential dc offset voltage					± 30	mV
FM input sensitivity, for full scale (± 14 kHz				2.5		Vp-p
deviation)
FM input dc offset (wrt VHR)					± 80	mV
FM input idle channel noise, below full scale					± 50	dB
input
FM gain error					± 6%
Power supply rejection		f = 0 kHz to 15 kHz		40		dB

²Provides 12 dB headroom for AGC fading conditions.

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