CMX994 Datasheet, PDF (52/61 Pages) CML Microcircuits – Local Oscillator

Direct Conversion Receivers
CMX994/CMX994A/CMX994E
Notes:
1. Powersave mode current applies to both the following operating cases: (a) after a General Reset
command has been issued and with all analogue and digital supplies applied and also (b) with DV_DD
applied but with all analogue supplies disconnected. For case (b), DV_DD current will not exceed the
specified value and is independent of the state of the registers.
2. T_AMB = 25°C, not including any current drawn from the device pins by external circuitry.
3. Assumes 30pF on each C-BUS interface line and an operating serial clock frequency of 5MHz.
4. The stated current drawn here is with the bandgap reference and accompanying bias current
generators enabled only (General Control Register – $11), all other circuitry is disabled.
5. Not including any current drawn from the device pins by external circuitry or the bias current.
Rx Only – Rx Circuitry as enabled: Rx Gain Register = 0x00, General Control Register = 0xC2, Rx Control
Register = 0x10 and Intermodulation Control Register = 0x3F;
TX Only – General Control Register = 0x81, divide by 2 mode;
LNA Only – 0x82 is written to the General Control Register and 0xC0 to the Rx Control register;
I/Q Demodulator – 0x60 is written to the Rx Control register;
Baseband I/Q – 0xA0 is written to the Rx Control register;
VCO and Buffer – 0x88 is written to the General Control Register and 0x03 to the VCO Control Register;
LO Input – 0x84 is written to the General Control Register and 0x10 to the VCO Control Register;
PLL – 0x00 is written to the VCO Control Register, 0x82 is written to the General Control Register and
0x80 to PLL M register ($22).
5a. As note 5 except General Control Register ($11) b4 = ‘1’; see sections 7.2.1 and 8.1.5.
5b. As note 5 except Rx Gain Register ($16) b3 = ‘1’; see section 7.7.1.
5c. As note 5 except General Control Register ($11) b4 = ‘1’; see section 7.2.1, Option Control Register
($15) b0 = ‘1’ and b1 = ‘1’; see section 7.6.1.
5d. As note 5 except General Control Register ($11) b4 = ‘1’; see section 6.2.1, Option Control Register
($15) b3- b0 = ‘1011 or ‘0111’ section 6.6.1.
5e. As note 5 except Option Control Register ($15) b8 = ‘1’; see section 7.6.1
6. As measured from the rising edge of CSN.
7. Bias is enabled by General Control Register ($11) b7; see section 7.2.1
 2015 CML Microsystems Plc
Page 52 of 70
D/994_A_E/1